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1. TYPES AND SUBTYPES OF THE INFLUENZA VIRUS
2. Classification
3. Influenza subgroups Influenza A
highly infective
infects many species
causes widespread epidemics
Influenza B
found only in humans
capable of producing severe disease
causes regional epidemics
Influenza C
causes mild disease
humans are natural hosts, but isolates also found in pigs
does not cause epidemics
4. The virus nomenclature