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From the Department of Virus Diseases, Walter Reed Army Institute of Research, Washington, D. C. 20012
Abstract
The hemagglutination-inhibition (HI) test has been used extensively to document the presence of antibodies to various arboviruses in man and animals; its interpretation assumes that the observed HI reaction is due to viral antibody. That this is not always so has been reported for large numbers of hens (50% of 422 tested) and "antibody" for western equine encephalitis (WEE) virus (1), but only for a small number of turtles (1% to 2% of 166) reacting nonspecifically with eastern equine encephalitis (EEE) virus (2). During a period of EEE virus dissemination on the Eastern Shore of Maryland, substantial numbers of turtle sera inhibited EEE but not WEE hemagglutinins. Moreover, seroconversions in some of these turtles led us to believe initially that they might be naturally infected. While subsequent tests of these sera showed no neutralizing antibody, the apparent seroconversions by HI test were unexplained.
Footnotes
1 Present address: Department of Veterinary Science, University of Wisconsin, Madison, Wisconsin 53706.
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