1. School of Public Health, Bahir Dar University, Bahir Dar P.O. Box 79, Ethiopia
2. Amhara Public Health Institute, Bahir Dar P.O. Box 3898, Ethiopia
3. Awi Zone Health Office, Amhara Regional State Health Bureau, Bahir Dar P.O. Box 79, Ethiopia
4. Division of Infectious Diseases, Saint Louis University, Saint Louis, MO 63104, USA