Summary
20 to 37 per cent of wild Japanese tree sparrows had neutralizing antibodies to Japanese encephalitis virus (JEV). Sparrows free of antibodies were inoculated with 10,000 plaque-forming units of JEV. None of the birds became clinically ill. Virus could be detected in blood plasma during the first 3 days after inoculation but not thereafter. Neutralizing antibodies started to appear at 4 days after inoculation and the response was of variable duration, in some cases extending up to 200 days after inoculation.
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References
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Hasegawa, T., Takehara, Y. & Takahashi, K. Natural and experimental infections of Japanese tree sparrows with Japanese encephalitis virus. Archives of Virology 49, 373–376 (1975). https://doi.org/10.1007/BF01318247
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DOI: https://doi.org/10.1007/BF01318247