influenza A

in·flu·en·za A

the most common type of influenza. These strains have a high propensity for antigenic change resulting in mutations, partly because they can infect various animals where dual infections can occur, giving rise to new hybrid strains. The infections occur in epidemics, which may occur every 2-3 years and may vary in size and severity; perhaps the most important of the three types of influenza (A, B, and C).
Farlex Partner Medical Dictionary © Farlex 2012

influenza A

Infectious disease An avian virus, especially of ducks–which in China live near the pig reservoir and 'vector'; periodic mutations of the virus–13 hemagglutination and 9 neuraminidase subtypes cause 'flu' epidemics and pandemics. See Antigenic drift, Antigenic shift. Cf Influenza B, Influenza C.
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.

in·flu·en·za A

Most common type of influenza, with a high propensity for antigenic change resulting in mutations, partly because they can infect various animals where dual infections can occur, giving rise to new hybrid strains. The infections occur in epidemics.
Medical Dictionary for the Dental Professions © Farlex 2012

Patient discussion about influenza A

Q. do i have a flu

A. What makes you think you have flu?

Do you have any of the signs or symptoms of it? (as listed here: or here:

Q. Should I get a flu shot? I was wondering if one should get a flu shot. Does it even work and protect from the flu?

A. In general, anyone who wants to reduce their chances of getting the flu can get vaccinated. However, it is recommended that certain people should get vaccinated each year. They are either people who are at high risk of having serious flu complications or people who live with or care for those at high risk for serious complications. People who should get vaccinated each year are:
1. Children aged 6 months up to their 19th birthday
2. Pregnant women
3. People 50 years of age and older
4. People of any age with certain chronic medical conditions
5. People who live in nursing homes and other long-term care facilities
6. People who live with or care for those at high risk for complications from flu, including: Health care workers, Household contacts of persons at high risk for complications from the flu and Household contacts and out of home caregivers of children less than 6 months of age (these children are too young to be vaccinated)

Q. Can you get influenza after a dentist visit? I’ve been to the dentist yesterday and I woke up sick. Is it considered mal practice?

A. o..relax..first of all you can get the flu anywhere and anytime. Secondly- it takes more than a day to develop symptoms so yo probably got it from someone else. It’s not mal practice anyway, and stop thinking on how you can get money off your dentist :) here is a Southpark episode about it:

More discussions about influenza A
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References in periodicals archive ?
Canine influenza is done in two segments are H3N8 virus and H3N2 (seasonal influenza A) virus.
Influenza B viruses predominated in the United States from late May through late June, and influenza A viruses predominated beginning in early July.
The influenza viruses detected have been a mixture of influenza A (H3N2), influenza H1N1 (2009), and influenza type B.
In Hong Kong, a study done by local experts showed that the magnitude of influenza A's summer peak has become higher in recent years in Hong Kong.
To the Editor: We have reviewed the literature cited in Tellier's Review of Aerosol Transmission of Influenza A Virus (1) and disagree that it supports the conclusions drawn regarding the importance of aerosols in natural influenza infection.
The drug was designed to treat and prevent various types of flu, and in laboratory tests has been shown to be a potent and selective inhibitor of influenza A and B neuraminidases.
While certain subtypes are found in specific animal hosts, birds are hosts to all subtypes of influenza A and are a repeated source of new flu pathogens.
(2005) proposed that a future avian influenza A pandemic might be contained at the source by targeted prophylaxis, quarantine, and prevaccination.
The reservoir for influenza A is believed to be wild birds.
During May 22-September 10, 2016, * the United States experienced typical low levels of seasonal influenza activity overall; beginning in late August, clinical laboratories reported a slight increase in influenza positive test results and CDC received reports of a small number of localized influenza outbreaks caused by influenza A (H3N2) viruses.
Seasonal influenza A (H3N2) is still being detected in very small numbers in parts of Asia and Australia.
Oseltamivir resistance caused by a single amino acid substitution from histidine (H) to tyrosine (Y) at position 274 of the neuraminidase active site has been reported in persons infected both experimentally and naturally with influenza A virus subtype H5N1 (1,2).