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serologic evidence of human and swine influenza in mayan persons.

antibodies against influenza viruses were detected in 115 serum samples from indigenous mayan persons from kochol, yucatan. seropositivity rates were 26.9% to a/bayern/7/95, 40.8% to a/sydney/5/97, 1.7% to a/swine/wisconsin/238/97, and 79.1% to a/swine/minnesota/593/99. this report is the first in mexico of the prevalence of antibodies to swine influenza virus in humans.