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Avian Influenza Research Progress
Ernesto P. Allegra
出版Nova Publishers, 2008
主題Medical / Infectious DiseasesMedical / EpidemiologyMedical / Veterinary Medicine / Food AnimalMedical / Veterinary Medicine / Small Animal
ISBN160021617X9781600216176
URLhttp://books.google.com.hk/books?id=Xl9GtrLkIx0C&hl=&source=gbs_api
EBookSAMPLE
註釋Avian influenza, or 'bird flu', is a contagious disease of animals caused by viruses that normally infect only birds and, less commonly, pigs. Avian influenza viruses are highly species-specific, but have, on rare occasions, crossed the species barrier to infect humans. In domestic poultry, infection with avian influenza viruses causes two main forms of disease, distinguished by low and high extremes of virulence. The so-called 'low pathogenic' form commonly causes only mild symptoms (ruffled feathers, a drop in egg production) and may easily go undetected. The highly pathogenic form is far more dramatic. It spreads very rapidly through poultry flocks, causes disease affecting multiple internal organs, and has a mortality that can approach 100%, often within 48 hours.