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|pagetitle =Orthomyxoviridae
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Influenza is a largely species-specific infection, but the threat of zoonotic potential is real. Virulence varies between strains, but all are spread by aerosol routes. They are typified by rhinitis, pyrexia, and anemia. Flu presents a particular challenge to vaccination as antigenic drift within the virus means that strains can vary from one year to the next. As such, vaccine produced from this year's virus may not give protection against next year's virus.
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<categorytree mode=pages>Orthomyxoviridae</categorytree>
|logo =Equine influenza logo.jpg
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==Morphology==
==Morphology==
**Current vaccines are always modeled on the most recent outbreaks of the flu in question, and cannot therefore protect against the evolution of the virus from year to year
**Current vaccines are always modeled on the most recent outbreaks of the flu in question, and cannot therefore protect against the evolution of the virus from year to year
**Partial protection can be provided against strains within the same ''subtype'', hence the continuation of vaccination shemes
**Partial protection can be provided against strains within the same ''subtype'', hence the continuation of vaccination shemes
[[Category:Viruses]]
[[Category:Viruses]]