Volume 11, Issue 1
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645



The results of serologic tests with Japanese encephalitis virus antigen and sera from humans on Taiwan and adjacent islands are reported. Seventy-one of 72 adult sera from various parts of Taiwan showed neutralizing antibody against JE virus. Neutralizing antibody was found in 32% of 120 sera from 7-year-old children. Tests with sera from the Taipei area show an increasing percentage of neutralizing antibody in children from 1 through 12 years of age. HI antibody tests on these children's serum taken before and after the 1958 encephalitis season showed 4% with fourfold titer rises and a similar percent with falls in titer. The children with antibody rises were 4 to 10 years of age. Similar studies in the nearby Pescadore Islands showed that infection was uncommon in children and that only half of the adults tested had neutralising antibody. A limited interpretation of these results is presented.


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