Seasonal changes of infectivity rates of Bancroftian filariasis vectors in coast province, Kenya
Background & objectives: Bancroftian filariasis in Kenya is endemic in coastal districts with anestimated number of 2.5 million people at risk of infection. The main mosquito genera involved intransmission of Wuchereria bancrofti in these areas are Anopheles, Culex and Mansonia. Thestudy was env...
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doaj-c5f91c4ff34e4131b6a3fca06843583d2020-11-24T21:40:38ZengWolters Kluwer Medknow PublicationsJournal of Vector Borne Diseases0972-90622009-09-01463219224Seasonal changes of infectivity rates of Bancroftian filariasis vectors in coast province, KenyaSichangi KasiliFlorence OyiekeC. WamaeCharles MbogodBackground & objectives: Bancroftian filariasis in Kenya is endemic in coastal districts with anestimated number of 2.5 million people at risk of infection. The main mosquito genera involved intransmission of Wuchereria bancrofti in these areas are Anopheles, Culex and Mansonia. Thestudy was envisaged to compare the infectivity rates of Bancroftian filariasis vectors between thehigh transmission (wet) and the low transmission (dry) seasons.Methods: Mosquitoes were sampled from houses and compounds from two study sites, Gazi andMadunguni, on the Kenyan coast. Day resting indoor collection (DRI), pyrethrum spray catch(PSC) and CDC light traps were used to collect mosquitoes. After identification, female mosquitoeswere dissected to search for W. bancrofti III stage larvae.Results: A total of 1832 female mosquitoes were dissected. Infectivity rates of vectors in Madunguniwere 1.49 and 0.21% in wet and dry seasons respectively, whereas in Gazi, these were 1.69 and0%, respectively. There was a significant difference in the infectivity rates between the two seasonsin both Madunguni and Gazi villages (p <0.05). Anopheles gambiae s.l. was the main vector inboth study sites followed by Culex quinquefasciatus and An. funestus.Conclusion: There was a difference in infectivity rates of Bancroftian filariasis vectors betweenthe wet and dry seasons. The abundance of An. gambiae s.s. during the transmission season couldbe responsible for the increased infectivity rates of vectors in this season.http://www.mrcindia.org/journal/issues/463219.pdfFilariasisnon-transmission seasontransmission seasonWuchereria bancrofti |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Sichangi Kasili Florence Oyieke C. Wamae Charles Mbogod |
spellingShingle |
Sichangi Kasili Florence Oyieke C. Wamae Charles Mbogod Seasonal changes of infectivity rates of Bancroftian filariasis vectors in coast province, Kenya Journal of Vector Borne Diseases Filariasis non-transmission season transmission season Wuchereria bancrofti |
author_facet |
Sichangi Kasili Florence Oyieke C. Wamae Charles Mbogod |
author_sort |
Sichangi Kasili |
title |
Seasonal changes of infectivity rates of Bancroftian filariasis vectors in coast province, Kenya |
title_short |
Seasonal changes of infectivity rates of Bancroftian filariasis vectors in coast province, Kenya |
title_full |
Seasonal changes of infectivity rates of Bancroftian filariasis vectors in coast province, Kenya |
title_fullStr |
Seasonal changes of infectivity rates of Bancroftian filariasis vectors in coast province, Kenya |
title_full_unstemmed |
Seasonal changes of infectivity rates of Bancroftian filariasis vectors in coast province, Kenya |
title_sort |
seasonal changes of infectivity rates of bancroftian filariasis vectors in coast province, kenya |
publisher |
Wolters Kluwer Medknow Publications |
series |
Journal of Vector Borne Diseases |
issn |
0972-9062 |
publishDate |
2009-09-01 |
description |
Background & objectives: Bancroftian filariasis in Kenya is endemic in coastal districts with anestimated number of 2.5 million people at risk of infection. The main mosquito genera involved intransmission of Wuchereria bancrofti in these areas are Anopheles, Culex and Mansonia. Thestudy was envisaged to compare the infectivity rates of Bancroftian filariasis vectors between thehigh transmission (wet) and the low transmission (dry) seasons.Methods: Mosquitoes were sampled from houses and compounds from two study sites, Gazi andMadunguni, on the Kenyan coast. Day resting indoor collection (DRI), pyrethrum spray catch(PSC) and CDC light traps were used to collect mosquitoes. After identification, female mosquitoeswere dissected to search for W. bancrofti III stage larvae.Results: A total of 1832 female mosquitoes were dissected. Infectivity rates of vectors in Madunguniwere 1.49 and 0.21% in wet and dry seasons respectively, whereas in Gazi, these were 1.69 and0%, respectively. There was a significant difference in the infectivity rates between the two seasonsin both Madunguni and Gazi villages (p <0.05). Anopheles gambiae s.l. was the main vector inboth study sites followed by Culex quinquefasciatus and An. funestus.Conclusion: There was a difference in infectivity rates of Bancroftian filariasis vectors betweenthe wet and dry seasons. The abundance of An. gambiae s.s. during the transmission season couldbe responsible for the increased infectivity rates of vectors in this season. |
topic |
Filariasis non-transmission season transmission season Wuchereria bancrofti |
url |
http://www.mrcindia.org/journal/issues/463219.pdf |
work_keys_str_mv |
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