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Assessment of neutralizing antibodies elicited by a vaccine (Nakayama) strain of Japanese encephalitis virus in Taiwan

Published online by Cambridge University Press:  01 August 1997

W. R.-H. SHYU
Affiliation:
Institute of Preventive Medicine, National Defense Medical Center, Sanhsia, Taipei, Taiwan
Y.-C. WANG
Affiliation:
Institute of Preventive Medicine, National Defense Medical Center, Sanhsia, Taipei, Taiwan
C. CHIN
Affiliation:
Institute of Preventive Medicine, National Defense Medical Center, Sanhsia, Taipei, Taiwan
W.-J. CHEN
Affiliation:
Department of Parasitology, Chang Gung College of Medicine and Technology, Kwei-San, Tao-Yuan, Taiwan
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Abstract

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A total of 368 blood specimens were resampled from a serum collection containing 2914 blood samples which were collected by a random sampling in Taiwan in 1991. The plaque reduction neutralization test was applied to evaluate the neutralizing ability to two strains of Japanese encephalitis viruses, i.e. Nakayama (the present vaccine strain) and JE5 (a Taiwan isolate). The result revealed that antibodies against JE virus were present in each stratified age group. Antibody positive rates were both highest in the group older than 70 years although the lowest rates were located in different groups. In addition, the result showed that the immunogenicity potency of the antibody induced by the vaccine strain did not have a good coverage against JE5. The rate of neutralizing antibodies above the level of protective efficacy of the present vaccine was limited as low as 37·93%. Efficacy of the vaccine used at present was apparently not efficient. Consideration of a more promising vaccine may be necessary.

Type
Research Article
Copyright
© 1997 Cambridge University Press
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