1 Department of Internal Medicine, Modibbo Adama University Teaching Hospital, Yola, Adamawa, Nigeria.
2 Public Health and Tropical Medicine, College of Public Health, Medical and Veterinary Sciences, James Cook University, Townsville, QLD, Australia.
3 Australian Institute of Tropical Health and Medicine, James Cook University, Townsville, QLD, Australia.
4 Department of Mathematics and Statistics, American University of Nigeria, Yola, Adamawa, Nigeria.
5 Department of Natural and Environmental Sciences, American University of Nigeria, Yola, Adamawa, Nigeria.
6 World Health Organization Collaborating Center for Vector-Borne and Neglected Tropical Diseases, College of Public Health, Medical and Veterinary Sciences, James Cook University, Townsville, QLD, Australia.