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25 results on '"Sungvornyothin, Sungsit"'

1. A new WHO bottle bioassay method to assess the susceptibility of mosquito vectors to public health insecticides: results from a WHO-coordinated multi-centre study

Author

Corbel, Vincent, Kont, Mara D., Ahumada, Martha Liliana, Andréo, Laura, Bayili, Bazoma, Bayili, Koama, Brooke, Basil, Pinto Caballero, Jesús A., Lambert, Ben, Churcher, Thomas S., Duchon, Stephane, Etang, Josiane, Flores, Adriana E., Gunasekaran, Kasinathan, Juntarajumnong, Waraporn, Kirby, Matt, Davies, Rachel, Lees, Rosemary Susan, Lenhart, Audrey, Lima, José Bento Pereira, Martins, Ademir J., Müller, Pie, N’Guessan, Raphael, Ngufor, Corine, Praulins, Giorgio, Quinones, Martha, Raghavendra, Kamaraju, Verma, Vaishali, Rus, Adanan Che, Samuel, Michael, Ying, Koou Sin, Sungvornyothin, Sungsit, Uragayala, Sreehari, Velayudhan, Raman, and Yadav, Rajpal S.

Published
2023
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4. A new WHO bottle bioassay method to assess the susceptibility of mosquito vectors to public health insecticides: results from a WHO-coordinated multi- centre study

Author

Corbel, Vincent, primary, Kont, Mara D., additional, Ahumada, Martha Liliana, additional, Andréo, Laura, additional, Bayili, Bazoma, additional, BAYILI, Koama, additional, Brooke, Basil, additional, Caballero, Jesús A. Pinto, additional, Lambert, Ben C., additional, Churcher, Thomas S., additional, Duchon, Stephane, additional, Etang, Josiane, additional, Flores, Adriana E., additional, Gunasekaran, Kasinathan, additional, Juntarajumnong, Waraporn, additional, Kirby, Matt, additional, Davies, Rachel, additional, Lees, Rosemary Susan, additional, Lenhart, Audrey, additional, Lima, José Bento Pereira, additional, Martins, Ademir J., additional, Müller, Pie, additional, N’Guessan, Raphael, additional, Ngufor, Corine, additional, Praulins, Giorgio, additional, Quinones, Martha, additional, Raghavendra, Kamaraju, additional, Rus, Adanan Che, additional, Samuel, Michael, additional, Verma, Vaishali, additional, Ying, Koou Sin, additional, Sungvornyothin, Sungsit, additional, Uragayala, Sreehari, additional, Velayudhan, Raman, additional, and Yadav, Rajpal S., additional

Published
2022
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6. Autofluorescence microscopy for paired-matched morphological and molecular identification of individual chigger mites (Acari: Trombiculidae), the vectors of scrub typhus

Author

Kumlert, Rawadee, Chaisiri, Kittipong, Anantatat, Tippawan, Stekolnikov, Alexandr A., Morand, Serge, Prasartvit, Anchana, Makepeace, Benjamin L., Sungvornyothin, Sungsit, Paris, Daniel H., Kumlert, Rawadee, Chaisiri, Kittipong, Anantatat, Tippawan, Stekolnikov, Alexandr A., Morand, Serge, Prasartvit, Anchana, Makepeace, Benjamin L., Sungvornyothin, Sungsit, and Paris, Daniel H.

Abstract

Background: Conventional gold standard characterization of chigger mites involves chemical preparation procedures (i.e. specimen clearing) for visualization of morphological features, which however contributes to destruction of the arthropod host DNA and any endosymbiont or pathogen DNA harbored within the specimen. Methodology/Principal findings: In this study, a novel work flow based on autofluorescence microscopy was developed to enable identification of trombiculid mites to the species level on the basis of morphological traits without any special preparation, while preserving the mite DNA for subsequent genotyping. A panel of 16 specifically selected fluorescence microscopy images of mite features from available identification keys served for complete chigger morphological identification to the species level, and was paired with corresponding genotype data. We evaluated and validated this method for paired chigger morphological and genotypic ID using the mitochondrial cytochrome c oxidase subunit I gene (coi) in 113 chigger specimens representing 12 species and 7 genera (Leptotrombidium, Ascoschoengastia, Gahrliepia, Walchia, Blankaartia, Schoengastia and Schoutedenichia) from the Lao People's Democratic Republic (Lao PDR) to the species level (complete characterization), and 153 chiggers from 5 genera (Leptotrombidium, Ascoschoengastia, Helenicula, Schoengastiella and Walchia) from Thailand, Cambodia and Lao PDR to the genus level. A phylogenetic tree constructed from 77 coi gene sequences (approximately 640 bp length, n = 52 new coi sequences and n = 25 downloaded from GenBank), demonstrated clear grouping of assigned morphotypes at the genus levels, although evidence of both genetic polymorphism and morphological plasticity was found. Conclusions/Significance: With this new methodology, we provided the largest collection of characterized coi gene sequences for trombiculid mites to date, and almost doubled the number of available characterized coi gene sequen

Published
2018

8. Autofluorescence microscopy for paired-matched morphological and molecular identification of individual chigger mites (Acari: Trombiculidae), the vectors of scrub typhus

Author

Kumlert, Rawadee, primary, Chaisiri, Kittipong, additional, Anantatat, Tippawan, additional, Stekolnikov, Alexandr A., additional, Morand, Serge, additional, Prasartvit, Anchana, additional, Makepeace, Benjamin L., additional, Sungvornyothin, Sungsit, additional, and Paris, Daniel H., additional

Published
2018
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9. Geometric morphometrics of the scutum for differentiation of trombiculid mites within the genus Walchia(Acariformes: Prostigmata: Trombiculidae), a probable vector of scrub typhus

Author

Sungvornyothin, Sungsit, Kumlert, Rawadee, Paris, Daniel H., Prasartvit, Anchana, Sonthayanon, Piengchan, Apiwathnasorn, Chamnarn, Morand, Serge, Stekolnikov, Alexandr A., and Sumruayphol, Suchada

Abstract

The vectors of scrub typhus are the larval stage of trombiculid mites, termed “chiggers”. These vectors are very small – the larvae are approximately 0.2 mm in size - and therefore their morphological identification is difficult. Trombiculid mites are widely distributed across Asia and they can be identified at the genus level by the shape, size and setae/sensilla distribution of their dorsal chitin plate (scutum = shield), while morphological identification at the species level requires more mite characteristics.

Published
2019
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15. Biting activity and host preference of the malaria vectors Anopheles maculatus and Anopheles sawadwongporni (Diptera: Culicidae) in Thailand

Author

Muenworn, Vithee, primary, Sungvornyothin, Sungsit, additional, Kongmee, Monthathip, additional, Polsomboon, Suppaluck, additional, Bangs, Michael J., additional, Akrathanakul, Pongthep, additional, Tanasinchayakul, Somchai, additional, Prabaripai, Atchariya, additional, and Chareonviriyaphap, Theeraphap, additional

Published
2009
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16. Biting Activity and Host Preference of the Malaria VectorsAnopheles maculatusandAnopheles sawadwongporni(Diptera: Culicidae) in Thailand

Author

Muenworn, Vithee, primary, Sungvornyothin, Sungsit, additional, Kongmee, Monthathip, additional, Polsomboon, Suppaluck, additional, Bangs, Michael J., additional, Akrathanakul, Pongthep, additional, Tanasinchayakul, Somchai, additional, Prabaripai, Atchariya, additional, and Chareonviriyaphap, Theeraphap, additional

Published
2009
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25. CORRELATION OF HOST SPECIFICITY, ENVIRONMENTAL FACTORS AND ORIENTAL RAT FLEA ABUNDANCE.

Author

Chotelersak K, Apiwathnasorn C, Sungvornyothin S, Panasoponkul C, Samung Y, and Ruangsittichai J

Subjects
Animals, Climate, Disease Vectors, Host Specificity, Seasons, Temperature, Thailand, Ecosystem, Environment, Flea Infestations, Rats, Xenopsylla
Abstract

Fleas are the vectors of many communicable diseases that are normally found in oriental rats. Climate and environmental changes influence the habitat and migration patterns of vectors. In this study, the oriental rat flea abundance, represented as total flea index, was determined in correlation to host specificity and various environmental factors. The number of hosts and fleas calculated from 3 specific habitats (shipping area, decayed area, and market area) from July 2010 to June 2011. The results showed that the common hosts in the shipping area and decayed area were Rattus rattus and R. exulans, with the total flea indexes of 3.36 and 1.58. R. norvegicus was the most common host identified in the market area. Fleas were virtually absent in rat hosts collected from the market area. Both the density of reservoir hosts and the total flea index were positively correlated with the mean annual rainfall and temperature. These data could be useful for control of rat populations in each specific habitat.

Published
2015

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