1. U.S Naval Medical Research Unit 3, Cairo Infection Control Unit Ext. Ramsis Rd, adjutant Abbasia Fever Hospital, Postal Code 11517, Cairo, Egypt
2. U.S Naval Medical Research Unit 3, Cairo, Egypt
3. Ministry of Health and Population, Cairo, Egypt.
4. Ford Foundation, Cairo, Egypt
5. Centers for Disease Control and Prevention, Atlanta, Georgia, USA