alexa West Nile virus in Pakistan. 1. Sero-epidemiological studies in Punjab Province.
Surgery

Surgery

Tropical Medicine & Surgery

Author(s): Hayes CG, Baqar S, Ahmed T, Chowdhry MA, Reisen WK, Hayes CG, Baqar S, Ahmed T, Chowdhry MA, Reisen WK

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Abstract Serum samples collected during 1978-79 from residents of the Chiniot and Changa Manga National Forest (CMF) areas of Punjab Province, Pakistan, had over-all neutralizing (N) antibody positive rates for West Nile (WN) virus of 32.8\% (n = 192) and 38.5\% (n = 239), respectively. Comparison of the age-specific antibody rates indicated that the pattern of exposure to infection was different in the two areas. Samples from a 1968 serosurvey of residents of the CMF area had an age-specific N antibody profile similar to the 1978 CMF sample, but both the over-all N and haemagglutination-inhibition (HI) antibody positive rates were much higher in the 1968 sample. When tested against antigen prepared from the Pakistan I-746 strain of WN virus, the percentage of sera HI antibody positive and the geometric mean titre of the sera were significantly higher than when tested against the Egypt-101 antigen. One of 124 and 11 of 50 sera from the 1978 and 1968 samples from CMF exhibited detectable HI antibody against dengue-3 virus, respectively, indicating cross-reacting flavivirus antibody was present. None of the positive sera had a higher titre against dengue-3 than against WN virus, but four of the 1968 sera reacted to equal titre against both antigens. During the 1978-79 CMF survey, serum samples from domestic and wild animals were tested for WN virus antibody. Of the 317 wild birds captured, 85 were N-antibody positive. The only frequently bled mammal was the Indian cow, from which 21 of 58 samples were positive for WN antibody.
This article was published in Trans R Soc Trop Med Hyg and referenced in Tropical Medicine & Surgery

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