Osoro AA

Kisii Medical Training College, P.O. Box 1165-40200, Kisii

Ng’ang’a Z

Jomo Kenyatta University of Agriculture and Technology, Institute of Tropical Medicine and Infectious Diseases

Mutugi M

Jomo Kenyatta University of Agriculture and Technology, Department of Zoology

Wanzala P

Kenya Medical Research Foundation (KEMRI), Nairobi