Epidemic of equine influenza among vaccinated racehorses in Japan in 2007.

摘要: On August 2007, we encountered equine influenza epidemic by Florida sub-lineage strain (H3N8) in Japan Racing Association's facilities where 4142 racehorses total were stabled. The number of new febrile cases sharply increased, but the occurrence was rapidly calmed down within 2 weeks. morbidity rate these 12.8% and subclinical infection healthy examined rapid antigen detection tests 19.4% at early stage epidemic. serological studies along with low existence numbers asymptomatically infected racehorses, suggested that cross-reactivity antibodies provided vaccination against contributed to reducing duration