Avian Influenza

Avian Influenza - AVIAN INFLUENZA • • • • Virus –...

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Virus – potentially zoonotic Orthomyxoviruses – 8 segments of RNA AI viruses are subject to mutation o Low pathogenic can easily mutate to high pathogenic All high pathogenic AI strains are H5 or H7 o Many H5 and H7 are low pathogenic Low vs. High pathogenic Based on ability to make chickens ill Inject chickens – number that dies Also can use amino acid cleavage sites Natural reservoir = migratory water birds (ducks, geese, shorebirds) * In general, these waterfowl don’t get sick – just act as carriers Transmitted : Direct contact with nasal or oral secretions, feces Also fomites – equipment, trucks, shoes L P A I - drop in feed consumption - egg production with deformed eggshells - slight increase in mortality - upper respiratory signs sneezing, swelling around the eyes Other possibilities – differential diagnosis new castle disease infectious laryngotracheitis avian pneumoviruses infectious bronchitis mycoplasma Chlamydia in turkeys
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This note was uploaded on 04/30/2008 for the course AVS 332 taught by Professor Launer during the Spring '08 term at Rhode Island.

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Avian Influenza - AVIAN INFLUENZA • • • • Virus –...

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