Accession Number:

ADA279320

Title:

Community-Based Prevalence Profile of Arboviral, Rickettsial, and Hantaan-Like Viral Antibody in the Nile River Delta of Egypt

Descriptive Note:

Corporate Author:

NAVAL MEDICAL RESEARCH UNIT NO 3 CAIRO (EGYPT) DEPT OF MEDICAL ZOOLOGY

Report Date:

1993-01-01

Pagination or Media Count:

10.0

Abstract:

To determine the current prevalence of antibody to arboviruses, rickettsiae, and hantaan-like viruses. a survey was carried out in the Nile River Valley of Egypt, one of the principal foci of the 1977-1978 Rift Valley fever RVF outbreak. Blood specimens were obtained from 915 persons representing 190 study households. Enzyme immunoassay testing showed that the overall prevalence of IgG antibody was 4 to sand fly fever Sicilian SFS, 2 to sandfly fever Naples SFN, 15 to RVF, 20 to West Nile, and 4 to Hantaan HTN viruses. Antibody was demonstrated among 32 of the same study subjects to Coxiella burnetii, 58 to Rickettsia typhi. and 32 to R. conorii. The prevalence of agent-specific antibody tended to increase with age. Particularly notable was the low prevalence of RVF infection in children born after the height of the RVF outbreak. No detectable antibodies were found in the population less than seven years of age and in only 3 of those 7-12 years old. In contrast, 26 of the study population 13-19 years old, who were young children and infants at the time of the outbreak, were found to have RVF antibodies, suggesting that the level of intensity associated with transmission decreased considerably following the documented 1977-1978 outbreak. Geometric mean titers GMT ranged from 139 for C. burnetti to 1,305 for RVF, and did not vary significantly by age, except for high titers for RVF in the 20-10-49-year- old age group. A significant upward trend in GMT was also noted when antibody was detected in the specimen for more than one phlebovirus. This was observed for SFS, SFN, and RVF, i.e., 1,172 for RVF only, 1,334 for RVF and SFN. 1.828 for RVF with SFS, and 2,111 for RVF with SFN and SFS P 0.05.

Subject Categories:

  • Medicine and Medical Research
  • Microbiology

Distribution Statement:

APPROVED FOR PUBLIC RELEASE