The authors wish to thank the people of Kisii Municipality who participated in the study and the staff of the Ministry of Health at Kisii District Hospital, who assisted in this study.
We particularly appreciate the work by Henry Sendora during specimen examination and Dr Wycliffe Mogoa for his technical and logistical support.
Special thanks to the Teachers Service Commission (Kenya) for granting a study leave to RMN.
This study was supported by Kisii District Hospital and Gusii Institute of Science and Technology and we thank the two institutions.