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There have been several over the decades. The first one found was the one that pigs get (hence the name), H1N1, in the1930's. Then when people started being able to catch that one or mutations of that one, there is speculation that there could have been several others in retrospect, including the "Spanish Flu" that started the influenza pandemic in 1918, but there are no longer samples to test that hypothesis. Then there was the 1976 Swine Flu (see more in related questions), and now most recently, the H1N1/09 swine flu, the one that caused the 2009 pandemic and still circulating and making people ill today.
See the related questions below, about when swine flu started and what caused the 2009 swine flu to develop, for more details.
there are three known subtypes of human flu virus A: H1N1, H1N2, and H3N2. Avian viruses can infect pigs, but people are generally not affected. That changed when there was an outbreak of H5N1 in Hong Kong in 1997.
The influenza virus, commonly known as the flu, comes in approximately 25 separate strains. There are 16 proteins known as HA, which is known scientifically as hemagglutinin, and nine strains of NA protein, known scientifically as neuraminidase.
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How many Influenza A subtypes can infect birds?
There are 15 different Influenza A subtypes that can infect birds
How many types of the Influenza Viruses are there?
According to the United States Center for Disease Control and Prevention, there are 4 types of Influenza viruses, but only three infect humans (A, B & C). Influenza D infects cattle and is not known to infect people.
How many types are there of influenza viruses?
According to the United States Center for Disease Control and Prevention, there are 4 types of Influenza viruses, but only three infect humans (A, B & C). Influenza D infects cattle and is not known to infect people.
Where does influenza circulate when it is not infecting humans?
Can't It hide away in your cells for a while before it decides to infect you?
Does influenza A virus infect turtles?
No. Most viruses target certain cells. In the case of influenza A, some mammals (including humans) and some birds have been infected.
What organism does the influenza infect?
Influenza primarily infects birds and mammals, including humans. It is a virus that affects the respiratory system and can cause symptoms such as fever, cough, and body aches.
What is the difference between influenza type A and type B?
Influenza type A and type B are two different strains of the influenza virus. Type A is more common and has the ability to infect animals, while type B primarily infects humans. Type A viruses are categorized into subtypes based on two proteins on the surface of the virus, hemagglutinin (H) and neuraminidase (N), which helps determine their potential to cause pandemics.
Are all influenza Type A viruses the Swine Flu?
No, the pandemic A-H1N1/09 "swine flu" is just one of many Type A influenza strains. It is also one of many H1N1 flu subtypes. Besides Type A influenzas, there are also influenza Types B and C in humans.
What does the A stand for in Influenza A virus?
The "A" in Influenza A virus stands for the type of virus classification. Influenza viruses are categorized into types A, B, and C based on their genetic and antigenic characteristics. Influenza A viruses commonly infect humans and animals and are known to cause pandemics.
What do influenza viruses look like?
Influenza viruses are spherical or oval in shape and have a membrane envelope studded with protein spikes. These spikes help the virus attach to and infect host cells. Under electron microscopy, influenza viruses appear as tiny particles with a diameter of about 80–120 nanometers.
What is the difference between Flu A and Flu B?
They are caused by two different kinds of viruses. There are three types of influenza viruses that have been classified according to the types of proteins they have. There are Type A, Type B, and Type C influenza viruses. Type A and B each have many different strains. Type C does not.Type A influenza is one of the more common types we see in the seasonal flu among humans and it is also a very common type that many other animals get. It has subtypes and strains that differ, which is why having one subtype will not give you immunity from all the other subtypes and strains.Type B influenza is also a common type among humans and is found only in humans. It is not divided into subtypes but there are multiple strains.Type C has been found in humans, pigs, and dogs. The symptoms are usually very mild, milder than those of Type A and B influenza viruses, and it typically doesn't cause epidemics. It is not divided into different subtypes or strains.
What viruses can infect your airway?
Three that come to mind are adenovirus, influenza, and RSV.
