1. Department of Veterinary Microbiology and Parasitology; Faculty of Veterinary Medicine; University of Ibadan; Ibadan Nigeria
2. Institute of Parasite Disease Prevention and Control; Henan Center for Disease Prevention and Control; Zhengzhou China
3. Department of Medical Microbiology and Parasitology; University College Hospital; Ibadan Nigeria
4. Division of Foodborne, Waterborne and Environmental Diseases; Centers for Disease Control and Prevention; Atlanta GA USA