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Potential factors influencing lymphatic filariasis transmission in"hotspot"and"control"areas in Ghana:the importance of vectors

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Infectious Diseases of Poverty 2019年第1期8卷 45-55页

作者： Sellase Pi-Bansa joseph harold nyarko osei Kwadwo Kyeremeh Frempong Elizabeth Elhassan osei Kweku Akuoko David Agyemang Collins Ahorlu Maxwell Alexander Appawu Benjamin Guibehi Koudou Michael David Wilson Dziedzom Komi de Souza Samuel Kweku Dadzie Jurg Utzinger Daniel Adjei Boakye Swiss Tropical and Public Health Institute BaselSwitzerland University of Basel BaselSwitzerland Noguchi Memorial Institute for Medical Research College of Health SciencesUniversity of GhanaLegonGhana Department of Animal Biology and Conservation Science University of GhanaLegonGhana SightSavers International Ghana OfficeAccraGhana African Regional Postgraduate Programme in Insect Science University of GhanaLegonGhana Vector Biology Department Liverpool School of Tropical MedicineLiverpoolUK Centre Suisse de Recherches Scientifiques en Cote d'Ivoire AbidjanCote d'Ivoire

Background:Mass drug administration(MDA)programmes for the control of lymphatic filariasis in Ghana,have been ongoing in some endemic districts for 16 *** current study aimed to assess factors that govern the success of MDA programmes for breaking transmission of lymphatic filariasis in ***:The study was undertaken in two"hotspot"districts(Ahanta West and Kassena Nankana West)and two control districts(Mpohor and Bongo)in *** were collected and identified using morphological and molecular tools.A proportion of the cibarial armatures of each species was *** were performed onAnopheles gambiae for filarial worm detection.A questionnaire was administered to obtain information on MDA compliance and vector control *** were compared between districts to determine factors that might explain persistent transmission of lymphatic ***:High numbers of mosquitoes were sampled in Ahanta West district compared to Mpohor district(F=16.09,P=0.002).There was no significant difference between the numbers of mosquitoes collected in Kassena Nankana West and Bongo districts(F=2.16,P=0.185).Mansonia species were predominant in Ahanta West *** mosquitoes were prevalent in all *** with infected and infective filarial worms was found only in Ahanta West *** differences were found in cibarial teeth numbers and shape for mosquito species in the surveyed *** MDA coverage was high in all *** average use of bednet and indoor residual spraying was 82.4 and 66.2%,*** was high compliance in the five preceding MDA rounds in Ahanta West and Kassena Nankana West districts,both considered hotspots of lymphatic filariasis ***:The study on persistent transmission of lymphatic filariasis in the two areas in Ghana present information that shows the importance of local understanding of factors affecting control and elimination of lymphatic

关键词： Ghana Hotspots Lymphatic filariasis Mass drug administration Microfilariae Systematic non-compliance Vector control

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Ecology, Distribution and Risk of Transmission of Viral Haemorrhagic Fevers by Aedes Mosquitoes around the Port Areas of Tema in Southern Ghana

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Advances in Entomology 2022年第2期10卷 135-148页

作者： Kenechukwu C. Ojukwu joseph Chabi Kwadwo Frempong Delphina A. Adabie-Gomez joseph harold nyarko osei Andy Asafu-Adjaye Sellase Pi-Bansa Michelle Adimazoya Kojo Y. Sakyi Kwaku O. Akuoko Ruth Brenyah Maxwell A. Appawu Samuel Kweku Dadzie African Regional Postgraduate Programme in Insect Science University of Ghana Accra Ghana Parasitology Department Noguchi Memorial Institute of Medical Research University of Ghana Accra Ghana School of Veterinary Medicine University of Ghana Accra Ghana Department of Clinical Microbiology School of Medical Science Kwame Nkrumah University of Science and Technology Kumasi Ghana

Aedes-borne diseases remain a public health challenge for many countries globally. The extent of spread of invasive species of Aedes mosquitoes and risk of transmission of the diseases especially around the point of entry of goods such as ports is not well known in Ghana. This study investigated the ecology, distribution and risk of transmission of viral haemorrhagic fevers by Aedes mosquitoes around the port areas of Tema, Southern Ghana. The mosquitoes from this study were collected using human landing catches, ovitraps and larval collections for a period of six months. A total of 1092 containers were inspected in both seasons and of these, 237 (21.7%) were positive for mosquito larvae or pupae in rainy season while 181 (16.6%) were positive in dry season. A total of 6498 mosquitoes were collected and identified morphologically using taxonomic keys. 6038 (92.9%) were Aedes aegypti, 337 (5.2%) were Culex spp. and 123 (1.9%) were Anopheles gambiae. The Ae. aegypti larvae were found breeding in a series of water-holding containers which included disposed plastic containers, earthenware pots, car tyres, plastic barrels, plastic basins, buckets, metal drums, jerrycans and poly tank. A high proportion of Aedes aegypti eggs were found in the ovitraps during the rainy season than in the dry season in the study sites. Ae. aegypti was the most common mosquitoes biting mostly outdoors (65.6%) with more bites occurring in the rainy season (63.6%) in the two residential sites (Tema Community One and Tema New Town). The risk of transmission of viral haemorrhagic fever in the study sites was assessed using House Index, Container Index, Breteau Index and was found to be higher in Tema New town area with seasonal variations within the sites. The man-vector contact rates for the two residential sites were also found to be higher in rainy season than the dry season. These observations indicate that the risk of transmission of viral haemorrhagic fevers in the study areas is high espe

关键词： Viral Haemorrhagic Fevers Tema Port Areas Aedes Risk of Transmission

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