A Review of the 1996–98 Nonpathogenic H7N2 Avian Influenza Outbreak in Pennsylvania

摘要: Abstract The nonpathogenic avian influenza (AI) outbreak in Pennsylvania began December 1996 when there was a trace back from New York live bird market to dealer's flock. A total of 18 commercial layer flocks, two pullet and meat turkey flock were diagnosed with AI (H7N2) viral infection an economic loss estimated at between $3 $4 million. Clinical histories flocks infected the disease included respiratory disease, elevated morbidity mortality throughout house, egg production drops, depression, lethargy. unique gross lesion layers severe, transmural oviduct edema white gray flocculent purulent material lumen. Layer on separate premises quarantined but permitted remain facilities until cessation virus shed determined through isolation. Several months later, clinical appeared again these flocks. It is not known whether recurrence of...