Influenzavirus A

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former genus name for the viruses that cause influenza, now found to be two different genera, which were named influenzavirus A and influenzavirus B.
Influenzavirus A a genus of viruses containing the agent of influenza A. See also influenza virus.
Influenzavirus B a genus of viruses containing the agent of influenza B. See also influenza virus.
Influenzavirus C a genus of viruses containing the agent of influenza C. See also influenza virus.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.
References in periodicals archive ?
'While all three types can mutate, or change into new strains, type A flu mutates constantly, yielding new strains of the virus,' notes The Medical Advisor: The Complete Guide to Alternative and Conventional Treatments.
Other local hospitals are seeing more of the Type A flu as well.
The vast majority was caused by a nasty version of Type A flu, the so-called H3N2 branch of the viral family that tends to trigger more pneumonia and other complications than other forms of influenza and is particularly risky to seniors.
Another concern during this flu season has been the increase in type A flu viruses that have become resistant to Tamiflu, or oseltamivir, the most commonly prescribed antiviral flu medication.
Type A flu is the most common and is often the culprit in large-scale epidemics.
If Type A flu vaccine is unavailable, or if medical reasons prohibit its usage, amantadine can be continued as long as 90 days for those continuously or repeatedly exposed to the disease during an epidemic.