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4. Atmospheric velocity fields in tepid main sequence stars

Author

Landstreet, J. D., Kupka, F., Ford, H. A., Officer, T., Sigut, T. A. A., Silaj, J., Strasser, S., and Townshend, A.

Subjects
Astrophysics - Solar and Stellar Astrophysics
Abstract

The line profiles of the stars with v sin i below a few km/s can reveal direct signatures of local velocity fields (e.g. convection) in stellar atmospheres. This effect is well established in cool main sequence stars, and has been detected and studied in three A stars. This paper reports observations of main sequence B, A and F stars with two goals: (1) to identify additional stars having sufficiently low values of v sin i to search for spectral line profile signatures of local velocity fields, and (2) to explore how the signatures of the local velocity fields in the atmosphere depend on stellar parameters such as effective temperature T_eff and peculiarity type. For stars having T_eff below about 10000 K, we always detect local atmospheric velocity fields indirectly through a non-zero microturbulence parameter, but not for hotter stars. Among the A and F stars in our sample having the sharpest lines, direct tracers of atmospheric velocity fields are found in six new stars. The velocity field signatures identified include asymmetric excess line wing absorption, deeper in the blue line wing than in the red; line profiles of strong lines that are poorly fit by computed profiles; and strong lines that are broader than they should be for the v sin i values deduced from weak lines. These effects are found in both normal and Am stars, but seem stronger in Am stars. These data still have not been satisfactorily explained by models of atmospheric convection, including numerical simulations., Comment: Acepted for publication by Astronomy and Astrophysics

Published
2009
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5. Weak magnetic fields in Ap/Bp stars: Evidence for a dipole field lower limit and a tentative interpretation of the magnetic dichotomy

Author

Auriere, M., Wade, G. A., Silvester, J., Lignieres, F., Bagnulo, S., Bale, K., Dintrans, B., Donati, J. F., Folsom, C. P., Gruberbauer, M., Hoa, A. Hui Bon, Jeffers, S., Johnson, N., Landstreet, J. D., Lebre, A., Lueftinger, T., Marsden, S., Mouillet, D., Naseri, S., Paletou, F., Petit, P., Power, J., Rincon, F., Strasser, S., and Toque, N.

Subjects
Astrophysics
Abstract

We have investigated a sample of 28 well-known spectroscopically-identified magnetic Ap/Bp stars, with weak, poorly-determined or previously undetected magnetic fields, with the aim of exploring the weak part of the magnetic field distribution of Ap/Bp stars. Using the MuSiCoS and NARVAL spectropolarimeters we have obtained 282 LSD Stokes V signatures of our 28 sample stars. All stars were detected, showing clearly that when observed with sufficient precision, all firmly classified Ap/Bp stars show detectable surface magnetic fields. To better characterise the surface magnetic field intensities and geometries of the sample, we have inferred the dipolar field intensity and the magnetic obliquity. The distribution of derived dipole strengths for these stars exhibits a plateau at about 1 kG, falling off to larger and smaller field strengths. Remarkably, in this sample of stars selected for their presumably weak magnetic fields, we find only 2 stars for which the derived dipole strength is weaker than 300 G. We interpret this "magnetic threshold" as a critical value necessary for the stability of large-scale magnetic fields, and develop a simple quantitative model that is able to approximately reproduce the observed threshold characteristics. This scenario leads to a natural explanation of the small fraction of intermediate-mass magnetic stars. It may also explain the near-absence of magnetic fields in more massive B and O-type stars., Comment: Accepted by Astronomy & Astrophysics, 17 Sept. 07. 23 pages, 32 figures

Published
2007
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6. The magnetic Bp star 36 Lyncis, I. Magnetic and photospheric properties

Author

Wade, G. A., Smith, M. A., Bohlender, D. A., Ryabchikova, T. A., Bolton, C. T., Lueftinger, T., Landstreet, J. D., Petit, P., Strasser, S., Blake, M., and Hill, G. M.

Subjects
Astrophysics
Abstract

This paper reports the photospheric, magnetic and circumstellar gas characteristics of the magnetic B8p star 36 Lyncis (HD 79158). Using archival data and new polarised and unpolarised high-resolution spectra, we redetermine the basic physical properties, the rotational period and the geometry of the magnetic field, and the photospheric abundances of various elements.}{Based on magnetic and spectroscopic measurements, we infer an improved rotational period of $3.83475\pm 0.00002$ d. We determine a current epoch of the longitudinal magnetic field positive extremum (HJD 2452246.033), and provide constraints on the geometry of the dipole magnetic field ($i\geq 56\degr$, $3210 {\rm G}\leq B_{\rm d}\leq 3930$ G, $\beta$ unconstrained). We redetermine the effective temperature and surface gravity using the optical and UV energy distributions, optical photometry and Balmer line profiles ($T_{\rm eff}=13300\pm 300$ K, $\log g=3.7-4.2$), and based on the Hipparcos parallax we redetermine the luminosity, mass, radius and true rotational speed ($L=2.54\pm 0.16 L_\odot, M=4.0\pm 0.2 M_\odot, R=3.4\pm 0.7 R_\odot, v_{\rm eq}=45-61.5$ \kms). We measure photospheric abundances for 21 elements using optical and UV spectra, and constrain the presence of vertical stratification of these elements. We perform preliminary Doppler Imaging of the surface distribution of Fe, finding that Fe is distributed in a patchy belt near the rotational equator. Most remarkably, we confirm strong variations of the H$\alpha$ line core which we interpret as due to occultations of the star by magnetically-confined circumstellar gas., Comment: Accepted by Astronomy and Astrophysics

Published
2006
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7. The magnetic field and confined wind of the O star $\theta^1$~Orionis~C

Author

Wade, G. A., Fullerton, A. W., Donati, J. -F., Landstreet, J. D., Petit, P., and Strasser, S.

Subjects
Astrophysics
Abstract

In this paper we confirm the presence of a globally-ordered, kG-strength magnetic field in the photosphere of the young O star $\theta^1$~Orionis~C, and examine the properties of its optical line profile variations. A new series of high-resolution MuSiCoS Stokes $V$ and $I$ spectra has been acquired which samples approximately uniformly the rotational cycle of $\theta^1$~Orionis~C. Using the Least-Squares Deconvolution (LSD) multiline technique, we have succeeded in detecting variable Stokes $V$ Zeeman signatures associated with the LSD mean line profile. These signatures have been modeled to determine the magnetic field geometry. We have furthermore examined the profi le variations of lines formed in both the wind and photosphere using dynamic spectra. Based on spectrum synthesis fitting of the LSD profiles, we determine that the polar strength of the magnetic dipole component is $1150 \la B_{\rm d}\la 1800$~G and that the magnetic obliquity is $27\degr \la \beta \la 68\degr$, assuming $i=45\pm 20\degr$. The best-fit values for $i=45\degr$ are $B_{\rm d} = 1300 \pm 150 (1\sigma)$~G and $\beta = 50\degr \pm 6\degr (1\sigma)$. Our data confirm the previous detection of a magnetic field in this star, and furthermore demonstrate the sinusoidal variability of the longitudinal field and accurately determine the phases and intensities of the magnetic extrema. The analysis of ``photospheric'' and ``wind'' line profile variations supports previous reports of the optical spectroscopic characteristics, and provides evidence for infall of material within the magnetic equatorial plane.

Published
2006
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8. The Southern Galactic Plane Survey: HI Observations and Analysis

Author

McClure-Griffiths, N. M., Dickey, J. M., Gaensler, B. M., Green, A. J., Haverkorn, M., and Strasser, S.

Subjects
Astrophysics
Abstract

We describe the HI component of the Southern Galactic Plane Survey (SGPS). The SGPS is a large-scale project to image at arcminute resolution the HI spectral line and 21 cm continuum emission in parts of the plane of the Milky Way. The survey covers Galactic longitudes 253 deg < l < 358 deg and latitudes |b| <1.5 deg (SGPS I), plus a first quadrant extension covering 5 deg < l < 20 deg and |b| <1.5 deg (SGPS II). The survey combines data from the Australia Telescope Compact Array and the Parkes Radio Telescope for sensitivity to angular scales ranging from 2 arcminutes to several degrees. The combined data cover 325 sq-deg and have an rms sensitivity of 1.6 K. Here we describe the HI observations and data reduction in detail, and present examples from the final data products. The complete dataset is publicly available through the Australia Telescope National Facility's HI Surveys archive. This dataset provides an unprecedented view of the neutral component of interstellar hydrogen in the inner Milky Way., Comment: 26 pages, 7 figures. To appear in ApJ Supplement Series. Full resolution version at http://www.atnf.csiro.au/people/nmcclure/papers/sgps_data.pdf

Published
2005
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9. Photospheric magnetic field and surface differential rotation of the FK Com star HD 199178

Author

Petit, P., Donati, J. -F., Oliveira, J. M., Auriere, M., Bagnulo, S., Landstreet, J. D., Lignieres, F., Lueftinger, T., Marsden, S., Mouillet, D., Paletou, F., Strasser, S., Toque, N., and Wade, G. A.

Subjects
Astrophysics
Abstract

We present spectropolarimetric observations of the FK Com star HD 199178 obtained between 1998 December and 2003 August at the Telescope Bernard Lyot (Observatoire du Pic du Midi, France). We report the detection of a photospheric magnetic field and reconstruct its distribution by means of Zeeman-Doppler Imaging. We observe large regions where the magnetic field is mainly azimuthal, suggesting that the dynamo processes generating the magnetic activity of HD 199178 may be active very close to the stellar surface. We investigate the rapid evolution of surface brightness and magnetic structures from a continuous monitoring of the star over several weeks in 2002 and 2003. We report that significant changes occur in the distribution of cool spots and magnetic regions on typical timescales of the order of 2 weeks. Our spectropolarimetric observations also suggest that the surface of HD 199178 is sheared by differential rotation, with a difference in rotation rate between equatorial and polar regions of the order of 1.5 times that of the Sun., Comment: 21 pages, 15 figures, accepted for publication in MNRAS, low quality figures due to limited size in preprint submission

Published
2004
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10. 1420 MHz Continuum Absorption Towards Extragalactic Sources in the Galactic Plane

Author

Strasser, S. T. and Taylor, A. R.

Subjects
Astrophysics
Abstract

We present a 21-cm emission-absorption study towards extragalactic sources in the Canadian Galactic Plane Survey (CGPS). We have analyzed HI spectra towards 437 sources with S > 150 mJy, giving us a source density of 0.6 sources per square degree at arcminute resolution. We present the results of a first analysis of the HI temperatures, densities, and feature statistics. Particular emphasis is placed on 5 features with observed spin temperatures below 40 K. We find most spin temperatures in the range from 40 K to 300 K. A simple HI two-component model constrains the bulk of the cold component to temperatures (T_c) between 40 K and 100 K. T_c peaks in the Perseus arm region and clearly drops off with Galactocentric radius, R, beyond that. The HI density follows this trend, ranging from a local value of 0.4 cm^{-3} to less than 0.1 cm^{-3} at R = 20 kpc. We find that HI emission alone on average traces about 75% of the total HI column density, as compared to the total inferred by the emission and absorption. Comparing the neutral hydrogen absorption to CO emission no correlation is found in general, but all strong CO emission is accompanied by a visible HI spectral feature. Finally, the number of spectral HI absorption features per kpc drop off exponentially with increasing R., Comment: 13 pages, 13 figures, Accepted for March 2004 ApJ

Published
2004
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11. Magnetic topology and surface differential rotation on the K1 subgiant of the RS CVn system HR 1099

Author

Petit, P., Donati, J. -F., Wade, G. A., Landstreet, J. D., Bagnulo, S., Lueftinger, T., Sigut, T. A. A., Shorlin, S. L. S., Strasser, S., Auriere, M., and Oliveira, J. M.

Subjects
Astrophysics
Abstract

We present here spectropolarimetric observations of the RS CVn system HR 1099 (V711 Tau) secured from 1998 February to 2002 January with the spectropolarimeter MuSiCoS at the Telescope Bernard Lyot (Observatoire du Pic du Midi, France). We apply Zeeman-Doppler Imaging and reconstruct brightness and magnetic surface topologies of the K1 primary subgiant of the system, at five different epochs. We confirm the presence of large, axisymmetric regions where the magnetic field is mainly azimuthal, providing further support to the hypothesis that dynamo processes may be distributed throughout the whole convective zone in this star. We study the short-term evolution of surface structures from a comparison of our images with observations secured at close-by epochs by Donati et al. (2003) at the Anglo-Australian Telescope. We conclude that the small-scale brightness and magnetic patterns undergo major changes within a timescale of 4 to 6 weeks, while the largest structures remain stable over several years. We report the detection of a weak surface differential rotation (both from brightness and magnetic tracers) indicating that the equator rotates faster than the pole with a difference in rotation rate between the pole and the equator about 4 times smaller than that of the Sun. This result suggests that tidal forces also impact the global dynamic equilibrium of convective zones in cool active stars., Comment: accepted by MNRAS

Published
2003
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16. Hepatocellular carcinoma progression during bridging before liver transplantation

Author

Renner P., Da Silva T., Schnitzbauer A. A., Verloh N., Schlitt H. J., Geissler E. K., Zulke C., Lamby P. E., Proneth A., Duvoux C., Burra P., Jauch K. -W., Rentsch M., Ganten T. M., Schmidt J., Settmacher U., Heise M., Rossi G., Cillo U., Kneteman N., Adam R., Van Hoek B., Bachellier P., Wolf P., Rostaing L., Bechstein W. O., Rizell M., Powell J., Hidalgo E., Gugenheim J., Wolters H., Brockmann J., Roy A., Mutzbauer I., Schlitt A., Beckebaum S., Graeb C., Nadalin S., Valente U., Sanchez Turrion V., Jamieson N., Scholz T., Colledan M., Fandrich F., Becker T., Soderdahl G., Chazouilleres O., Makisalo H., Pageaux G. -P., Steininger R., Soliman T., De Jong K. P., Pirenne J., Margreiter R., Pratschke J., Pinna A. D., Hauss J., Schreiber S., Strasser S., Klempnauer J., Troisi R. I., Bhoori S., Lerut J., Bilbao I., Klein C. G., Konigsrainer A., Otto G., Mazzaferro V., Neuhaus P., Renner, P, Da Silva, T, Schnitzbauer, A, Verloh, N, Schlitt, H, Geissler, E, Zulke, C, Lamby, P, Proneth, A, Duvoux, C, Burra, P, Jauch, K, Rentsch, M, Ganten, T, Schmidt, J, Settmacher, U, Heise, M, Rossi, G, Cillo, U, Kneteman, N, Adam, R, Van Hoek, B, Bachellier, P, Wolf, P, Rostaing, L, Bechstein, W, Rizell, M, Powell, J, Hidalgo, E, Gugenheim, J, Wolters, H, Brockmann, J, Roy, A, Mutzbauer, I, Schlitt, A, Beckebaum, S, Graeb, C, Nadalin, S, Valente, U, Sanchez Turrion, V, Jamieson, N, Scholz, T, Colledan, M, Fandrich, F, Becker, T, Soderdahl, G, Chazouilleres, O, Makisalo, H, Pageaux, G, Steininger, R, Soliman, T, De Jong, K, Pirenne, J, Margreiter, R, Pratschke, J, Pinna, A, Hauss, J, Schreiber, S, Strasser, S, Klempnauer, J, Troisi, R, Bhoori, S, Lerut, J, Bilbao, I, Klein, C, Konigsrainer, A, Otto, G, Mazzaferro, V, Neuhaus, P, and Publica

Subjects
Male, Carcinoma, Hepatocellular, Time Factor, Waiting Lists, AcademicSubjects/MED00910, Prognosi, Risk Factor, Middle Aged, Liver Transplantation, Treatment Outcome, Liver Neoplasm, Disease Progression, Female, Original Article, Survival Analysi, Neoplasm Recurrence, Local, AcademicSubjects/MED00010, Multivariate Analysi, Human
Abstract

Background Recipient selection for liver transplantation in hepatocellular carcinoma (HCC) is based primarily on criteria affecting the chance of long-term success. Here, the relationship between pretransplant bridging therapy and long-term survival was investigated in a subgroup analysis of the SiLVER Study. Methods Response to bridging, as defined by comparison of imaging at the time of listing and post-transplant pathology report, was categorized into controlled versus progressive disease (more than 20 per cent tumour growth or development of new lesions). Results Of 525 patients with HCC who had liver transplantation, 350 recipients underwent pretransplant bridging therapy. Tumour progression despite bridging was an independent risk factor affecting overall survival (hazard ratio 1.80; P = 0.005). For patients within the Milan criteria (MC) at listing, mean overall survival was longer for those with controlled versus progressive disease (6.8 versus 5.8 years; P

Published
2021

19. Prevalence and Clinical Outcomes of Poor Immune Response Despite Virologically Suppressive Antiretroviral Therapy Among Children and Adolescents With Human Immunodeficiency Virus in Europe and Thailand: Cohort Study

Author

Chappell, E., Riordan, A., Jourdain, G., Soriano-Arandes, A., Ene, L., Scherpbier, H., Warszawski, J., Collins, I., Smit, C., Marques, L., Klein, N., Guillén, S., Judd, A., Thorne, C., Goodall, R., Königs, C., Spoulou, V., Prata, F., Goetghebuer, T., Chiappini, E., Galli, L., Naver, L., Giaquinto, C., Gibb, D., Marczynska, M., Okhonskaia, L., Klimkait, T., Lallemant, M., Ngo-Giang-Huong, N., Kiseleva, G., Malyuta, R., Volokha, A., Hainaut, M., Delforge, M., Le Chenadec, J., Ramos, E., Dialla, O., Wack, T., Laurent, C., Ait Si Selmi, L., Leymarie, I., Ait Benali, F., Brossard, M., Boufassa, L., Floch-Tudal, C., Firtion, G., Hau, I., Chace, A., Bolot, P., Blanche, S., Levine, M., Bicëtre, L., Fourcade, C., Heller-Roussin, B., Runel-Belliard, C., Tricoire, J., Chirouze, C., Reliquet, V., Brouard, J., Kebaili, K., Fialaire, P., Lalande, M., Schultze-Strasser, S., Baumann, U., Niehues, T., Neubert, J., Kobbe, R., Berlin, C., Feiterna-Sperling, C., Buchholz, B., Notheis, G., de Martino, M., Angelo Tovo, P., Patrizia, O., Larovere, D., Ruggeri, M., Faldella, G., Baldi, F., Badolato, R., Montagnani, C., Venturini, E., Lisi, C., Di Biagio, A., Taramasso, L., Giacomet, V., Erba, P., Esposito, S., Lipreri, R., Salvini, F., Tagliabue, C., Cellini, M., Bruzzese, E., Lo Vecchio, A., Rampon, O., Donà, D., Romano, A., Dodi, I., Maccabruni, A., Consolini, R., Bernardi, S., Tchidjou Kuekou, H., Genovese, O., Olmeo, P., Cristiano, L., Mazza, A., Gabiano, C., Garazzino, S., Pellegatta, A., Pajkrt, D., Weijsenfeld, A., de Boer CG, Jurriaans, S., Back, N., Zaaijer, H., Berkhout, B., Cornelissen, M., Schinkel, C., Wolthers, K., Fraaij, P., van Rossum AMC, van der Knaap LC, Visser, E., Koopmans, M., van Kampen JJA, Pas, S., Henriet, S., van de Flier, M., van Aerde, K., Strik-Albers, R., Rahamat-Langendoen, J., Stelma, F., Schölvinck, E., de Groot-de Jonge, H., Niesters, H., van Leer-Buter CC, Knoester, M., Bont, L., Geelen, S., Wolfs, T., Nauta, N., Ang, C., van Houdt, R., Pettersson, A., Vandenbroucke-Grauls, C., Reiss, P., Bezemer, D., van Sighem AI, Wit, F., Boender, T., Zaheri, S., Hillebregt, M., de Jong, A., Bergsma, D., Grivell, S., Jansen, A., Raethke, M., Meijering, R., de Groot, L., van den Akker, M., Bakker, Y., Claessen, E., El Berkaoui, A., Koops, J., Kruijne, E., Lodewijk, C., Munjishvili, L., Peeck, B., Ree, C., Regtop, R., Ruijs, Y., Rutkens, T., Schoorl, M., Timmerman, A., Tuijn, E., Veenenberg, L., van der Vliet, S., Wisse, A., Woudstra, T., Tuk, B., Popielska, J., Pokorska-Śpiewak, M., Ołdakowska, A., Zawadka, K., Coupland, U., DorobaLaura Marques, M., Teixeira, C., Fernandes, A., Voronin, E., Miloenko, M., Labutina, S., Tomás Ramos, J., Prieto, L., Luisa Navarro, M., Saavedra, J., Santos, M., Angeles Muñoz, M., Ruiz, B., Mc Phee CF, de Ory SJ, Alvarez, S., Ángel Roa, M., Beceiro, J., Martínez, J., Badillo, K., Apilanez, M., Pocheville, I., Garrote, E., Colino, E., Gómez Sirvent, J., Garzón, M., Román, V., Montesdeoca, A., Mateo, M., José Muñoz, M., Angulo, R., Neth, O., Falcón, L., Terol, P., Luis Santos, J., Moreno, D., Lendínez, F., Grande, A., José Romero, F., Lillo, M., Losada, B., Herranz, M., Bustillo, M., Guerrero, C., Collado, P., Antonio Couceiro, J., Pérez, A., Isabel Piqueras, A., Bretón, R., Segarra, I., Gavilán, C., Jareño, E., Montesinos, E., Dapena, M., Álvarez, C., Gloria Andrés, A., Marugán, V., Ochoa, C., Alfayate, S., Isabel Menasalvas, A., de Miguel, E., Aebi-Popp, K., Asner, S., Aubert, V., Battegay, M., Baumann, M., Bernasconi, E., Böni, J., Brazzola, P., Bucher, H., Calmy, A., Cavassini, M., Ciuffi, A., Duppenthaler, A., Dollenmaier, G., Egger, M., Elzi, L., Fehr, J., Fellay, J., Francini, K., Furrer, H., Fux, C., Grawe, C., Günthard, H., Haerry, D., Hasse, B., Hirsch, H., Hoffmann, M., Hösli, I., Kahlert, C., Kaiser, L., Keiser, O., Kovari, H., Kouyos, R., Ledergerber, B., Martinetti, G., de Tejada BM, Metzner, K., Müller, N., Nicca, D., Paioni, P., Pantaleo, G., Polli, C., Posfay-Barbe, K., Rauch, A., Rudin, C., Schmid, P., Scherrer, A., Speck, R., Tarr, P., Thanh Lecompte, M., Trkola, A., Vernazza, P., Wagner, N., Wandeler, G., Weber, R., Wyler, C., Yerly, S., Techakunakorn, P., Hansudewechakul, R., Kham, C., Wanchaitanawong, V., Theansavettrakul, S., Sai, M., Nanta, S., Ngampiyaskul, C., Phanomcheong, S., Hongsiriwon, S., Karnchanamayul, W., Kwanchaipanich, R., Kanjanavanit, S., Kamonpakorn, N., Nantarukchaikul, M., Layangool, P., Mekmullica, J., Lucksanapisitkul, P., Watanayothin, S., Lertpienthum, N., Warachit, B., Hanpinitsak, S., Potchalongsin, S., Thanasiri, P., Krikajornkitti, S., Attavinijtrakarn, P., Srirojana, S., Bunjongpak, S., Puangsombat, A., Na-Rajsima, S., Ananpatharachai, P., Akarathum, N., Phuket, V., Lawtongkum, W., Kheunjan, P., Suriyaboon, T., Saipanya, A., Than-In-At, K., Jaisieng, N., Suaysod, R., Chailoet, S., Naratee, N., Kawilapat, S., Kaleeva, T., Baryshnikova, Y., Soloha, S., Bashkatova, N., Raus, I., Glutshenko, O., Ruban, Z., Prymak, N., Bailey, H., Bamford, A., Butler, K., Doerholt, K., Doherty, C., Foster, C., Francis, K., Harrison, I., Kenny, J., Letting, G., Mcmaster, P., Murau, F., Nsangi, E., Peters, H., Prime, K., Shackley, F., Shingadia, D., Storey, S., Tudor-Williams, G., Turkova, A., Welch, S., Jeannie Collins, I., Cook, C., Crichton, S., Dobson, D., Fairbrother, K., M Gibb D, Harper, L., Le Prevost, M., Van Looy, N., Walsh, A., Thrasyvoulou, L., Bernatoniene, J., Manyika, F., Sharpe, G., Subramaniam, B., Sloper, K., Fidler, K., Hague, R., Price, V., Clapson, M., Flynn, J., Cardoso, A., Abou-Rayyah, M., Gurtin, D., Yeadon, S., Segal, S., Ball, C., Hawkins, S., Dowie, M., Bandi, S., Percival, E., Eisenhut, M., Duncan, K., Clough, S., Anguvaa, L., Conway, S., Flood, T., Pickering, A., Murphy, C., Daniels, J., Lees, Y., Thompson, F., Williams, B., Pope, S., Cliffe, L., Smyth, A., Southall, S., Freeman, A., Freeman, H., Christie, S., Gordon, A., Rogahn, D., Clarke, L., Jones, L., Offerman, B., Greenberg, M., Benson, C., Ibberson, L., Faust, S., Hancock, J., Sharland, M., Lyall, H., Monrose, C., Seery, P., Menson, E., Callaghan, A., Bridgwood, A., Evans, J., Blake, E., Yannoulias, A., Critchton, S., Duff, C., Gomezpena, D., Lundin, R., Mangiarini, L., Nardone, A., Posfay Barbe, Klara, Universidad de Alcalá - University of Alcalá (UAH), Department of Sciences for Woman and Child's Health, Università degli Studi di Firenze = University of Florence (UniFI), Épidémiologie clinique, santé mère-enfant et VIH en Asie du Sud-Est (IRD_PHPT), Harvard University-Chiang Mai University (CMU), Centre de recherche en épidémiologie et santé des populations (CESP), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Paris-Sud - Paris 11 (UP11)-Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Hôpital Paul Brousse-Institut National de la Santé et de la Recherche Médicale (INSERM), Centre Hospitalier de Saint-Denis [Ile-de-France], CHU Necker - Enfants Malades [AP-HP], Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP), Laboratoire Chrono-environnement (UMR 6249) (LCE), Centre National de la Recherche Scientifique (CNRS)-Université de Franche-Comté (UFC), Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC), service de maladies infectieuses CHU J Minjoz Besancon, Service des maladies infectieuses et tropicales [CHU Nantes], Centre hospitalier universitaire de Nantes (CHU Nantes), Service de Pédiatrie Médicale [Caen], Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-CHU Caen, Normandie Université (NU)-Tumorothèque de Caen Basse-Normandie (TCBN)-Tumorothèque de Caen Basse-Normandie (TCBN), Service d'hématologie : Immuno-Hématologie pédiatrique et transplantation de moelle osseuse, Hôpital Debrousse, Hospices Civils de Lyon (HCL)-Hospices Civils de Lyon (HCL), Centre Hospitalier Régional Universitaire [Montpellier] (CHRU Montpellier), Universitätsklinikum Frankfurt, Infectious Diseases, San Martino Hospital, Università degli studi di Genova = University of Genoa (UniGe), Department of Maternal and Pediatric Sciences, University of Milan, Fondazione IRCCS Ospedale Maggiore Policlinico, Mangiagalli e Regina Elena, Maternal-Infantile Department, Unit of Paediatrics and Oncohematology, University Hospital of Parma, Department of Infectious Diseases, IRCCS S. Matteo, Department of Paediatrics, Università cattolica del Sacro Cuore = Catholic University of the Sacred Heart [Roma] (Unicatt), Dipartimento di Ingegneria [Benevento], Università degli Studi del Sannio, University of Twente, Institut de génétique humaine (IGH), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Laboratory for Infectious Diseases and Perinatal Screening, Center for Infectious Disease Control, National Institute for Public Health and the Environment [Bilthoven] (RIVM), Architecture et réactivité de l'ARN (ARN), Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Synthèse, Structure et Propriétés de Matériaux Fonctionnels (STEP), SYstèmes Moléculaires et nanoMatériaux pour l’Energie et la Santé (SYMMES), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Département Interfaces pour l'énergie, la Santé et l'Environnement (DIESE), Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Stichting HIV Monitoring, Universidade Federal do Ceará = Federal University of Ceará (UFC), Departamento de Química Orgánica, Universidade de Vigo, Polytechnical University of Valencia, Fac Biol, Dept Genet, Universidad Complutense de Madrid = Complutense University of Madrid [Madrid] (UCM), University of the Basque Country/Euskal Herriko Unibertsitatea (UPV/EHU), Service des maladies infectieuses, Hôpitaux Universitaires de Genève (HUG), University of Basel (Unibas), Dysfonctions métaboliques et diabètes: Mécanismes et approches thérapeutiques, Université Nice Sophia Antipolis (1965 - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-IFR50-Institut National de la Santé et de la Recherche Médicale (INSERM), University Heart Centre Freiburg - Bad Krozingen, Prapokklao Hospital [Chanthaburi, Thailand], Nakornping Hospital [Chiang Mai, Thailand], Samutsakhon Hospital [Samutsakhon, Thailand], Kalasin Hospital [Kalasin, Thailand], Sanpatong Hospital [Chiang Mai, Thailand], Chiang Mai University (CMU), Microbiology Department, St. Jame's Hospital, University of Edinburgh, Infectious Diseases and Microbiology Unit, Great Ormond Street Hospital for Children [London] (GOSH)-Institute of Child Health, European Synchrotron Radiation Facility (ESRF), Centre for Ecology and Hydrology [Bangor] (CEH), Natural Environment Research Council (NERC), Jet Propulsion Laboratory (JPL), NASA-California Institute of Technology (CALTECH), University of London [London], London South Bank University (LSBU), Dipartimento di Pediatria, Azienda Ospedaliera di Padova, Université Grenoble Alpes - UFR Pharmacie (UGA UFRP), Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), The European Pregnancy and Paediatric HIV Cohort Collaboration (EPPICC) Study Group in EuroCoord, Florence University, Harvard University [Cambridge]-Chiang Mai University (CMU), Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Université Paris-Sud - Paris 11 (UP11)-Hôpital Paul Brousse-Institut National de la Santé et de la Recherche Médicale (INSERM)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ), Laboratoire Chrono-environnement - CNRS - UBFC (UMR 6249) (LCE), Centre Hospitalier Régional Universitaire de Besançon (CHRU Besançon), University of Genoa (UNIGE), Catholic University of Rome, University of Twente [Netherlands], Institut de Chimie du CNRS (INC)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), University of the Basque Country [Bizkaia] (UPV/EHU), Université Nice Sophia Antipolis (... - 2019) (UNS), Pediatrics, Virology, Chappell, Elizabeth, Riordan, Andrew, Jourdain, Gonzague, Soriano-Arandes, Antoni, Ene, Luminita, J Scherpbier, Henriette, Warszawski, Josiane, J Collins, Intira, Smit, Colette, Marques, Laura, Klein, Nigel, Guillén, Sara, Judd, Ali, Thorne, Claire, Goodall, Ruth, Königs, Christoph, Spoulou, Vana, Prata, Filipa, Goetghebuer, Tessa, Chiappini, Elena, Galli, Luisa, Naver, Lar, Giaquinto, Carlo, M Gibb, Diana, Marczynska, Magdalena, Okhonskaia, Liubov, Klimkait, Thoma, Lallemant, Marc, Ngo-Giang-Huong, Nicole, Kiseleva, Galyna, Malyuta, Ruslan, Volokha, Alla, Hainaut, Marc, Delforge, Marc, Le Chenadec, Jerome, Ramos, Elisa, Dialla, Olivia, Wack, Thierry, Laurent, Corine, Ait Si Selmi, Lamya, Leymarie, Isabelle, Ait Benali, Fazia, Brossard, Maud, Boufassa, Leila, Floch-Tudal, Corinne, Firtion, Ghislaine, Hau, Isabelle, Chace, Anne, Bolot, Pascal, Blanche, Stéphane, Levine, Martine, Kremlin Bicëtre, Le, Fourcade, Corinne, Heller-Roussin, Brigitte, Runel-Belliard, Camille, Tricoire, Joëlle, Chirouze, Catherine, Reliquet, Véronique, Brouard, Jacque, Kebaili, Kamila, Fialaire, Pascale, Lalande, Muriel, Schultze-Strasser, Stephan, Baumann, U, Niehues, T, Neubert, J, Kobbe, R, Berlin, Charite, Feiterna-Sperling, C, Königs, C, Buchholz, B, Notheis, G, de Martino, Maurizio, Angelo Tovo, Pier, Patrizia, Osimani, Larovere, Domenico, Ruggeri, Maurizio, Faldella, Giacomo, Baldi, Francesco, Badolato, Raffaele, Montagnani, Carlotta, Venturini, Elisabetta, Lisi, Catiuscia, Di Biagio, Antonio, Taramasso, Lucia, Giacomet, Vania, Erba, Paola, Esposito, Susanna, Lipreri, Rita, Salvini, Filippo, Tagliabue, Claudia, Cellini, Monica, Bruzzese, Eugenia, LO VECCHIO, Andrea, Paediatric Infectious Diseases / Rheumatology / Immunology, Amsterdam institute for Infection and Immunity, AII - Infectious diseases, Amsterdam Reproduction & Development (AR&D), APH - Aging & Later Life, Infectious diseases, and Global Health

Subjects
0301 basic medicine, medicine.medical_treatment, lnfectious Diseases and Global Health Radboud Institute for Molecular Life Sciences [Radboudumc 4], HIV Infections, Rate ratio, Cohort Studies, 0302 clinical medicine, Pregnancy, Antiretroviral Therapy, Highly Active, Prevalence, 030212 general & internal medicine, Child, poor immune response, ddc:618, Immunosuppression, Viral Load, Hepatitis B, Thailand, 3. Good health, Europe, Thailand/epidemiology, Infectious Diseases, Cohort, Coinfection, Female, Cohort study, Adult, Microbiology (medical), viral suppression, medicine.medical_specialty, Adolescent, Anti-HIV Agents, antiretroviral therapy, 030106 microbiology, Europe/epidemiology, 03 medical and health sciences, children, Acquired immunodeficiency syndrome (AIDS), SDG 3 - Good Health and Well-being, Internal medicine, medicine, Humans, HIV, Aged, Settore MED/38 - Pediatria Generale e Specialistica, business.industry, Immunity, medicine.disease, HIV Infections/drug therapy/epidemiology, CD4 Lymphocyte Count, lnfectious Diseases and Global Health Radboud Institute for Health Sciences [Radboudumc 4], Anti-HIV Agents/therapeutic use, business, [SDV.MHEP]Life Sciences [q-bio]/Human health and pathology
Abstract

Background In human immunodeficiency virus (HIV)–positive adults, low CD4 cell counts despite fully suppressed HIV-1 RNA on antiretroviral therapy (ART) have been associated with increased risk of morbidity and mortality. We assessed the prevalence and outcomes of poor immune response (PIR) in children receiving suppressive ART. Methods Sixteen cohorts from the European Pregnancy and Paediatric HIV Cohort Collaboration (EPPICC) contributed data. Children Results Of 2318 children included, median age was 6.4 years and 68% had advanced/severe immunosuppression at ART initiation. At 1 year of VS, 12% had PIR. In multivariable analysis, PIR was associated with older age and worse immunological stage at ART start, hepatitis B coinfection, and residing in Thailand (all P ≤ .03). Rates of AIDS/death (95% confidence interval) per 100 000 person-years were 1052 (547, 2022) among PIR versus 261 (166, 409) among immune responders; rate ratio of 4.04 (1.83, 8.92; P < .001). Conclusions One in eight children in our cohort experienced PIR despite sustained VS. While the overall rate of AIDS/death was low, children with PIR had a 4-fold increase in risk of event as compared with immune responders.

Published
2020

22. Predictors of clinical response: results from a large, randomized controlled study with Tenofovir Disoproxil Fumarate (TDF) plus Peginterferon alfa-2A (PEG) combination for chronic hepatitis B (CHB)

Author

STRASSER, S, CHAN, H, AHN, S, CHUANG, W, HUI, A, TABAK, F, MEHTA, R, PETERSEN, J, LEE, C, MA, X, CARUNTU, F, TAK, W, ELKHASHAB, M, LIN, L, DINH, P, MARTINS, E, CHARUWORN, P, MCHUTCHISON, J, SUBRAMANIAN, GM, LIM, S, FOSTER, G, FUNG, S, MORANO, L, SAMUEL, D, AGARWAL, K, IDILMAN, R, BUTI, M, GAETA, G, PAPATHEODORIDIS, G, FLISIAK, R, and MARCELLIN, P

Published
2015

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