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Seroprevalence and subclinical infection rate (%; 95% CI) of HFRS among civilians living in two endemic areas before and after the major epidemic period (1997-1998)
*% of civilians with positive serologic tests, but had no HFRS vaccination for the previous three years. †% of civilians with seroconversion or four-fold rising antibody titer in paired sera, but had no vaccination and clinical symptoms and signs for HFRS.
