Malaria in migrant agricultural workers in western Ethiopia: entomological assessment of malaria transmission risk

Malaria Journal

Sisay Dugassa¹  Seth R. Irish²  Mathew Murphy²  Lena M. Lorenz³  Hiwot Solomon⁴  Gedeon Yohannes⁵  Yehualashet Tadesse⁶  Sheleme Chibsa⁷  Delenasaw Yewhalaw⁸ 

[1]Aklilu Lemma Institute of Pathobiology, Addis Ababa University, Addis Ababa, Ethiopia

[2]Centers for Disease Control and Prevention, 1600 Clifton Road, 30329-4027, Atlanta, GA, USA

[3]The US President’s Malaria Initiative, Bureau for Global Health, United States Agency for International Development, 1300 Pennsylvania Ave NW, 20523, Washington, DC, USA

[4]Department of Disease Control, London School of Hygiene & Tropical Medicine, Keppel Street, WC1E 7HT, London, UK

[5]College of Medicine & Veterinary Medicine, University of Edinburgh, University of Edinburgh, UK

[6]Disease prevention and control directorate, Federal Ministry of Health, Addis Ababa, Ethiopia

[7]The President’s Malaria Initiative Africa Indoor Residual Spraying Project, Abt Associates, Gerji Road, Sami Building, 1st Floor, Addis Ababa, Ethiopia

[8]The President’s Malaria Initiative Private Health Sector Project, Abt Associates Inc, Haile Gebreselassie road, Rebecca Building, 5th Floor, Addis Ababa, Ethiopia

[9]The US President’s Malaria Initiative, Bureau for Global Health, United States Agency for International Development, 1300 Pennsylvania Ave NW, 20523, Washington, DC, USA

[10]U.S. Agency for International Development (USAID), Entoto Street, Addis Ababa, Ethiopia

[11]Tropical and Infectious Diseases Research Center, Jimma University, Jimma, Ethiopia

[12]Department of Medical Laboratory Sciences and Pathology, College of Health Sciences, Jimma University, Jimma, Ethiopia

关键词: Anopheles arabiensis;    Malaria;    Ethiopia;    Agricultural development;    Migrant workers;   

DOI  :  10.1186/s12936-021-03633-1

来源: Springer

【 摘 要 】

BackgroundEthiopia has made great strides in malaria control over the last two decades. However, this progress has not been uniform and one concern has been reported high rates of malaria transmission in large agricultural development areas in western Ethiopia. Improved vector control is one way this transmission might be addressed, but little is known about malaria vectors in this part of the country.MethodsTo better understand the vector species involved in malaria transmission and their behaviour, human landing collections were conducted in Dangur woreda, Benishangul-Gumuz, between July and December 2017. This period encompasses the months with the highest rain and the peak mosquito population. Mosquitoes were identified to species and tested for the presence of Plasmodium sporozoites.ResultsThe predominant species of the Anopheles collected was Anopheles arabiensis (1,733; i.e. 61.3 % of the entire Anopheles), which was also the only species identified with sporozoites (Plasmodium falciparum and Plasmodium vivax). Anopheles arabiensis was collected as early in the evening as 18:00 h-19:00 h, and host-seeking continued until 5:00 h-6:00 h. Nearly equal numbers were collected indoors and outdoors. The calculated entomological inoculation rate for An. arabiensis for the study period was 1.41 infectious bites per month. More An. arabiensis were collected inside and outside worker’s shelters than in fields where workers were working at night.ConclusionsAnopheles arabiensis is likely to be the primary vector of malaria in the agricultural development areas studied. High rates of human biting took place inside and outdoor near workers’ residential housing. Improved and targeted vector control in this area might considerably reduce malaria transmission.

【 授权许可】

CC BY