Seasonal and diurnal biting activities and zoonotic filarial infections of two Simulium species (Diptera: Simuliidae) in northern Thailand

Seasonal and daily biting activity patterns, and natural filarial infections of adult black flies attracted to human bait were investigated at Ban Pang Faen, a rural area in Chiang Mai Province in northern Thailand. Collections were carried out twice a month from 06-00 to 18-00 hours from January 20...

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Main Authors: Y. Ishii, W. Choochote, O. Bain, M. Fukuda, Y. Otsuka, H. Takaoka
Format: Journal
Published: 2018
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http://cmuir.cmu.ac.th/jspui/handle/6653943832/60131
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Institution: Chiang Mai University
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spelling th-cmuir.6653943832-601312018-09-10T03:49:24Z Seasonal and diurnal biting activities and zoonotic filarial infections of two Simulium species (Diptera: Simuliidae) in northern Thailand Y. Ishii W. Choochote O. Bain M. Fukuda Y. Otsuka H. Takaoka Agricultural and Biological Sciences Immunology and Microbiology Medicine Veterinary Seasonal and daily biting activity patterns, and natural filarial infections of adult black flies attracted to human bait were investigated at Ban Pang Faen, a rural area in Chiang Mai Province in northern Thailand. Collections were carried out twice a month from 06-00 to 18-00 hours from January 2005 to February 2006. Among ten Simulium species collected, S. nodosum and S. asakoae were predominant occupying 57.3 % and 37.2 % of the total 16,553 females, respectively. These two predominant species showed different patterns in seasonal abundance: majority of S. nodosum (86.7 %) were collected in hot season (from mid February to mid May), while most of S. asakoae (74.5 %) were collected in rainy season (from mid May to mid October). For the daily biting activity, S. nodosum had two patterns: the main one was unimodal with a peak from 17-00 to 18-00, and the other was bimodal and had the major peak from 16-00 to 18-00 and the minor one from 07-00 to 09-00. The pattern of S. asakoae was mostly unimodal with a peak from 06-00 to 10-00. The filarial larvae found in S. nodosum and S. asakoae were morphologically different from each other. The short and thick infective larvae found in S. asakoae differed from all known filarial larvae; it is suggested that they might be a bird parasite, Splendidofilariinae or Lemdaninae. The infection of the mammophilic S. nodosum with large Onchocerca type infective larvae was confirmed in this area. Natural filarial infections were found in each month (except December) in either S. nodosum or S. asakoae or in both. Monthly infection rates with all stages of larvae were 0.6-5.0 % for S. nodosum, and 1.0-4.0 % for S. asakoae. It is suggested that people in this village are exposed to the risk of infection with zoonotic filariae throughout the year. 2018-09-10T03:38:25Z 2018-09-10T03:38:25Z 2008-01-01 Journal 1252607X 2-s2.0-46049105146 10.1051/parasite/2008152121 https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=46049105146&origin=inward http://cmuir.cmu.ac.th/jspui/handle/6653943832/60131
institution Chiang Mai University
building Chiang Mai University Library
country Thailand
collection CMU Intellectual Repository
topic Agricultural and Biological Sciences
Immunology and Microbiology
Medicine
Veterinary
spellingShingle Agricultural and Biological Sciences
Immunology and Microbiology
Medicine
Veterinary
Y. Ishii
W. Choochote
O. Bain
M. Fukuda
Y. Otsuka
H. Takaoka
Seasonal and diurnal biting activities and zoonotic filarial infections of two Simulium species (Diptera: Simuliidae) in northern Thailand
description Seasonal and daily biting activity patterns, and natural filarial infections of adult black flies attracted to human bait were investigated at Ban Pang Faen, a rural area in Chiang Mai Province in northern Thailand. Collections were carried out twice a month from 06-00 to 18-00 hours from January 2005 to February 2006. Among ten Simulium species collected, S. nodosum and S. asakoae were predominant occupying 57.3 % and 37.2 % of the total 16,553 females, respectively. These two predominant species showed different patterns in seasonal abundance: majority of S. nodosum (86.7 %) were collected in hot season (from mid February to mid May), while most of S. asakoae (74.5 %) were collected in rainy season (from mid May to mid October). For the daily biting activity, S. nodosum had two patterns: the main one was unimodal with a peak from 17-00 to 18-00, and the other was bimodal and had the major peak from 16-00 to 18-00 and the minor one from 07-00 to 09-00. The pattern of S. asakoae was mostly unimodal with a peak from 06-00 to 10-00. The filarial larvae found in S. nodosum and S. asakoae were morphologically different from each other. The short and thick infective larvae found in S. asakoae differed from all known filarial larvae; it is suggested that they might be a bird parasite, Splendidofilariinae or Lemdaninae. The infection of the mammophilic S. nodosum with large Onchocerca type infective larvae was confirmed in this area. Natural filarial infections were found in each month (except December) in either S. nodosum or S. asakoae or in both. Monthly infection rates with all stages of larvae were 0.6-5.0 % for S. nodosum, and 1.0-4.0 % for S. asakoae. It is suggested that people in this village are exposed to the risk of infection with zoonotic filariae throughout the year.
format Journal
author Y. Ishii
W. Choochote
O. Bain
M. Fukuda
Y. Otsuka
H. Takaoka
author_facet Y. Ishii
W. Choochote
O. Bain
M. Fukuda
Y. Otsuka
H. Takaoka
author_sort Y. Ishii
title Seasonal and diurnal biting activities and zoonotic filarial infections of two Simulium species (Diptera: Simuliidae) in northern Thailand
title_short Seasonal and diurnal biting activities and zoonotic filarial infections of two Simulium species (Diptera: Simuliidae) in northern Thailand
title_full Seasonal and diurnal biting activities and zoonotic filarial infections of two Simulium species (Diptera: Simuliidae) in northern Thailand
title_fullStr Seasonal and diurnal biting activities and zoonotic filarial infections of two Simulium species (Diptera: Simuliidae) in northern Thailand
title_full_unstemmed Seasonal and diurnal biting activities and zoonotic filarial infections of two Simulium species (Diptera: Simuliidae) in northern Thailand
title_sort seasonal and diurnal biting activities and zoonotic filarial infections of two simulium species (diptera: simuliidae) in northern thailand
publishDate 2018
url https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=46049105146&origin=inward
http://cmuir.cmu.ac.th/jspui/handle/6653943832/60131
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