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Possible contributing factors to the paucity of yellow fever epidemics in the Ashanti region of Ghana, west Africa.
East Afr Med J. 1996 Jan; 73(1):3-9.EA

Abstract

Yellow fever virus vectors identified in the Ashanti region of Ghana included Aedes aegypti, Aedes africanus, Aedes luteocephalus and Aedes vittatus. Other mosquito species, unrelated to yellow fever transmission, identified in this study included Culex tigripes, Culex thalassius, Culex decens, Culex tarsalis, Anopheles gambiae, Anopheles stephansi and Toxorynchites brevipalpis. Factors generally known to influence yellow fever transmission were also studied in the Ashanti region. These included Aedes mosquito larval indices, biting or man-contact rates, rainfall, relative humidity and duration of sunshine. Calculated values for these factors were found to be far below internationally accepted threshold values, due, perhaps, to the vast distribution, resilience and preferential predatory propensity of the larvae of T. brevipalpis, a mosquito species we found exclusively in the Ashanti region of Ghana, for A. aegypti larvae. Other predators of mosquito larvae encountered included Notonecta (Nepa species), Hydromerta, Culex tigripes, Belostoma and Lispa. The observed paucity of yellow fever outbreaks in the Ashanti region of Ghana may, in the main, be due to the preponderance resilience and selective predatory propensity and preference of T. brevipalpis for A. aegypti larvae. Furthermore, the observed presence of other predators which prey on A. aegypti larvae in the study areas, the low larval indices and the low man-vector contact rates recorded as well as the high prevalence of Group B antibodies found in the blood of the population of this region may also be contributory to the paucity of yellow fever outbreaks in the Ashanti region.

Authors+Show Affiliations

Department of Clinical Microbiology, School of Medical Sciences, University of Science and Technology, Kumasi, Ghana.No affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

8625858

Citation

Addy, P A., et al. "Possible Contributing Factors to the Paucity of Yellow Fever Epidemics in the Ashanti Region of Ghana, West Africa." East African Medical Journal, vol. 73, no. 1, 1996, pp. 3-9.
Addy PA, Esena RK, Atuahene SK. Possible contributing factors to the paucity of yellow fever epidemics in the Ashanti region of Ghana, west Africa. East Afr Med J. 1996;73(1):3-9.
Addy, P. A., Esena, R. K., & Atuahene, S. K. (1996). Possible contributing factors to the paucity of yellow fever epidemics in the Ashanti region of Ghana, west Africa. East African Medical Journal, 73(1), 3-9.
Addy PA, Esena RK, Atuahene SK. Possible Contributing Factors to the Paucity of Yellow Fever Epidemics in the Ashanti Region of Ghana, West Africa. East Afr Med J. 1996;73(1):3-9. PubMed PMID: 8625858.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Possible contributing factors to the paucity of yellow fever epidemics in the Ashanti region of Ghana, west Africa. AU - Addy,P A, AU - Esena,R K, AU - Atuahene,S K, PY - 1996/1/1/pubmed PY - 1996/1/1/medline PY - 1996/1/1/entrez SP - 3 EP - 9 JF - East African medical journal JO - East Afr Med J VL - 73 IS - 1 N2 - Yellow fever virus vectors identified in the Ashanti region of Ghana included Aedes aegypti, Aedes africanus, Aedes luteocephalus and Aedes vittatus. Other mosquito species, unrelated to yellow fever transmission, identified in this study included Culex tigripes, Culex thalassius, Culex decens, Culex tarsalis, Anopheles gambiae, Anopheles stephansi and Toxorynchites brevipalpis. Factors generally known to influence yellow fever transmission were also studied in the Ashanti region. These included Aedes mosquito larval indices, biting or man-contact rates, rainfall, relative humidity and duration of sunshine. Calculated values for these factors were found to be far below internationally accepted threshold values, due, perhaps, to the vast distribution, resilience and preferential predatory propensity of the larvae of T. brevipalpis, a mosquito species we found exclusively in the Ashanti region of Ghana, for A. aegypti larvae. Other predators of mosquito larvae encountered included Notonecta (Nepa species), Hydromerta, Culex tigripes, Belostoma and Lispa. The observed paucity of yellow fever outbreaks in the Ashanti region of Ghana may, in the main, be due to the preponderance resilience and selective predatory propensity and preference of T. brevipalpis for A. aegypti larvae. Furthermore, the observed presence of other predators which prey on A. aegypti larvae in the study areas, the low larval indices and the low man-vector contact rates recorded as well as the high prevalence of Group B antibodies found in the blood of the population of this region may also be contributory to the paucity of yellow fever outbreaks in the Ashanti region. SN - 0012-835X UR - https://www.unboundmedicine.com/medline/citation/8625858/Possible_contributing_factors_to_the_paucity_of_yellow_fever_epidemics_in_the_Ashanti_region_of_Ghana_west_Africa_ L2 - http://www.diseaseinfosearch.org/result/7583 DB - PRIME DP - Unbound Medicine ER -