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143 results on '"HYATT, ALEX D."'

7. Origin of the amphibian chytrid fungus

Author

Weldon, Che, du Preez, Louis H., Hyatt, Alex D., Muller, Reinhold, and Speare, Rick

Subjects
Xenopus -- Testing, Xenopus -- Diseases, Mycoses -- Development and progression
Abstract

The sudden appearance of chytridiomycosis, the cause of amphibian deaths and population declines in several continents, suggests that its etiologic agent, the amphibian chytrid Batrachochytrium dendrobatidis, was introduced into the [...]

Published
2004

8. Emerging infectious diseases and amphibian population declines

Author

Daszak Peter, Berger, Lee, Cunningham, Andrew A., Hyatt, Alex D., Green, D. Earl, and Speare, Rick

Subjects
Amphibians -- Diseases and pests, Wildlife diseases -- Research, Host-parasite relationships -- Analysis, Communicable diseases -- Environmental aspects
Abstract

This review presents data on two newly emerging chytridiomycosis and ranaviral wildlife infectious diseases and their impact on the global decline of amphibian populations. Amphibians affected are the golden toad of Costa Rica and seven Australian species including gastric-brooding frogs., We review recent research on the pathology, ecology, and biogeography of two emerging infectious wildlife diseases, chytridiomycosis and ranaviral disease, in the context of host-parasite population biology. We examine the [...]

Published
1999

9. Chytridiomycosis causes amphibian mortality associated with population declines in the rain forests of Australia and Central America

Author

Berger, Lee, Speare, Rick, Daszak, Peter, Green, D. Earl, Cunningham, Andrew A., Goggin, C. Louise, Slocombe, Ron, Ragan, Mark A., Hyatt, Alex D., McDonald, Keith R., Hines, Harry B., Lips, Karen R., Marantelli, Gerry, and Parkes, Helen

Subjects
Amphibians -- Patient outcomes, Mycoses -- Research, Wildlife diseases -- Research, Science and technology
Abstract

Epidermal changes caused by a chytridiomycete fungus (Chytridiomycota; Chytridiales) were found in sick and dead adult anurans collected from montane rain forests in Queensland (Australia) and Panama during mass mortality events associated with significant population declines. We also have found this new disease associated with morbidity and mortality in wild and captive anurans from additional locations in Australia and Central America. This is the first report of parasitism of a vertebrate by a member of the phylum Chytridiomycota. Experimental data support the conclusion that cutaneous chytridiomycosis is a fatal disease of anurans, and we hypothesize that it is the proximate cause of these recent amphibian declines.

Published
1998

10. Conservation Conundrum

Author

Brownell, Robert L., Curry, Barbara E., Van Bonn, William, Ridgway, Sam H., Daszak, Peter, Cunningham, Andrew A., and Hyatt, Alex D.

Published
2000

11. Novel Chlamydiaceae disease in captive salamanders

Author

Martel, An, Adriaensen, Connie, Bogaerts, Serge, Ducatelle, Richard, Favoreel, Herman, Crameri, Sandra, Hyatt, Alex D., Haesebrouck, Freddy, and Pasmans, Frank

Subjects
Salamanders -- Health aspects -- Research, Chlamydia infections -- Causes of -- Research -- Diagnosis, Health
Abstract

To the Editor: Although 2 major diseases of amphibians, chytridiomycosis and ranavirosis, have been relatively well studied, enigmatic amphibian disease and death not attributable to any of the known amphibian [...]

Published
2012
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12. Chytrid fungus in Europe

Author

Garner, Trenton W.J., Walker, Susan, Bosch, Jaime, Hyatt, Alex D., Cunningham, Andrew A., and Fisher, Matthew C.

Abstract

To the Editor: Amphibian species are declining at an alarming rate on a global scale (1). One of the major reasons for these declines is chytridiomycosis, caused by the chytridiomycete [...]

Published
2005

16. Preliminary characterization of Tasmanian aquareovirus (TSRV) isolates

Author

Zainathan, Sandra C., primary, Carson, Jeremy, additional, Crane, Mark St. J., additional, Williams, Lynette M., additional, Hoad, John, additional, Moody, Nicholas J. G., additional, Gudkovs, Nicholas, additional, Crameri, Sandra, additional, Hyatt, Alex D., additional, Young, John, additional, and Nowak, Barbara F., additional

Published
2016
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17. Feral cats and risk for Nipah virus transmission

Author

Epstein, Jonathan H., Rahman, Sohayati Abdul, Zambriski, Jennifer A., Halpin, Kim, Meehan, Greer, Jamaluddin, Abdul Aziz, Hassan, Sharifah Syed, Field, Hume E., Hyatt, Alex. D., and Daszak, Peter

Abstract

To the Editor: Nipah virus (NiV) emerged in peninsular Malaysia in 1998 and 1999 as a respiratory and neurologic disease of domestic pigs and an acute febrile encephalitic disease in [...]

Published
2006

19. Batrachochytrium dendrobatidis zoospore secretions rapidly disturb intercellular junctions in frog skin

Author

Brutyn, Melanie, primary, D’Herde, Katharina, additional, Dhaenens, Maarten, additional, Rooij, Pascale Van, additional, Verbrugghe, Elin, additional, Hyatt, Alex D., additional, Croubels, Siska, additional, Deforce, Dieter, additional, Ducatelle, Richard, additional, Haesebrouck, Freddy, additional, Martel, An, additional, and Pasmans, Frank, additional

Published
2012
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20. NovelChlamydiaceaeDisease in Captive Salamanders

Author

Martel, An, primary, Adriaensen, Connie, additional, Bogaerts, Sergé, additional, Ducatelle, Richard, additional, Favoreel, Herman, additional, Crameri, Sandra, additional, Hyatt, Alex D., additional, Haesebrouck, Freddy, additional, and Pasmans, Frank, additional

Published
2012
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25. Peruvian horse sickness virus and Yunnan orbivirus, isolated from vertebrates and mosquitoes in Peru and Australia

Author

Attoui, Houssam, primary, Mendez-lopez, Maria Rosario, additional, Rao, Shujing, additional, Hurtado-Alendes, Ana, additional, Lizaraso-Caparo, Frank, additional, Mohd Jaafar, Fauziah, additional, Samuel, Alan R., additional, Belhouchet, Mourad, additional, Pritchard, Lindsay I., additional, Melville, Lorna, additional, Weir, Richard P., additional, Hyatt, Alex D., additional, Davis, Steven S., additional, Lunt, Ross, additional, Calisher, Charles H., additional, Tesh, Robert B., additional, Fujita, Ricardo, additional, and Mertens, Peter P.C., additional

Published
2009
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46. Batrachochytrium dendrobatidis: requirement for further isolate collection and archiving.

Author

Voyles, Jamie, Richards-Hrdlicka, Katy, Cashins, Scott D., Rosenblum, Erica B., Hyatt, Alex D., Berger, Lee, and Skerratt, Lee F.

Subjects
BATRACHOCHYTRIUM dendrobatidis, AMPHIBIAN declines, AMPHIBIAN populations, CHYTRIDIOMYCOSIS, DATABASES, COMMUNICABLE diseases
Abstract

The article discusses a study on the known fungal pathogen Batrachochytrium dendrobatidis (Bd) isolates that have been collected and archived in various locations around the world. The study revealed that 53% of the 257 Bd isolates originate from ranids in the U.S. It is noted that Bd causes the disease chytridiomycosis, which is lethal to many species of amphibians worldwide. The creation of a centralized database of isolate information was suggested by the researchers due to unavailability of detailed information on isolate origin in many cases.

Published
2010
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48. Upward range extension of Andean anurans and chytridiomycosis to extreme elevations in response to tropical deglaciation.

Author

SEIMON, TRACIE A., SEIMON, ANTON, DASZAK, PETER, HALLOY, STEPHAN R.P., SCHLOEGEL, LISA M., AGUILAR, CÉSAR A., SOWELL, PRESTON, HYATT, ALEX D., KONECKY, BRONWEN, and E SIMMONS, JOHN

Subjects
AMPHIBIAN populations, HABITATS, FUNGAL communities, PATHOGENIC microorganisms, BATRACHOCHYTRIUM dendrobatidis, ECOLOGICAL niche
Abstract

High-alpine life forms and ecosystems exist at the limits of habitable environments, and thus, are especially sensitive to environmental change. Here we report a recent increase in the elevational limit of anurans following glacial retreat in the tropical Peruvian Andes. Three species have colonized ponds in recently deglaciated terrain at new record elevations for amphibians worldwide (5244–5400 m). Two of these species were also found to be infected with Batrachochytrium dendrobatidis ( Bd), an emerging fungal pathogen causally associated with global amphibian declines, including the disappearance of several Latin American species. The presence of this pathogen was associated with elevated mortality rates of at least one species. These results represent the first evidence of upward expansion of anurans to newly available habitat brought about by recent deglaciation. Furthermore, the large increase in the upper limit of known Bd infections, previously reported as 4112 m in Ecuador, to 5348 m in this study, also expands the spatial domain of potential Bd pathogenicity to encompass virtually all high elevation anuran habitats in the tropical Andes. [ABSTRACT FROM AUTHOR]

Published
2007
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50. Agricultural intensification, priming for persistence and the emergence of Nipah virus: a lethal bat-borne zoonosis

Author

Pulliam, Juliet R. C., Epstein, Jonathan H., Dushoff, Jonathan, Rahman, Sohayati A., Bunning, Michel, Jamaluddin, Aziz A., Hyatt, Alex D., Field, Hume E., Dobson, Andrew P., and Daszak, Peter

Abstract

Emerging zoonoses threaten global health, yet the processes by which they emerge are complex and poorly understood. Nipah virus (NiV) is an important threat owing to its broad host and geographical range, high case fatality, potential for human-to-human transmission and lack of effective prevention or therapies. Here, we investigate the origin of the first identified outbreak of NiV encephalitis in Malaysia and Singapore. We analyse data on livestock production from the index site (a commercial pig farm in Malaysia) prior to and during the outbreak, on Malaysian agricultural production, and from surveys of NiV's wildlife reservoir (flying foxes). Our analyses suggest that repeated introduction of NiV from wildlife changed infection dynamics in pigs. Initial viral introduction produced an explosive epizootic that drove itself to extinction but primed the population for enzootic persistence upon reintroduction of the virus. The resultant within-farm persistence permitted regional spread and increased the number of human infections. This study refutes an earlier hypothesis that anomalous El Niño Southern Oscillation-related climatic conditions drove emergence and suggests that priming for persistence drove the emergence of a novel zoonotic pathogen. Thus, we provide empirical evidence for a causative mechanism previously proposed as a precursor to widespread infection with H5N1 avian influenza and other emerging pathogens.

Published
2012
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