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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.
What else can I help you with?
How many Influenza A subtypes can infect birds?
There are 15 different Influenza A subtypes that can infect birds
What are the differences between influenza A and influenza B viruses?
Influenza A and influenza B viruses are both types of the flu, but they have some key differences. Influenza A viruses can infect both humans and animals, while influenza B viruses mainly infect humans. Influenza A viruses are more likely to cause pandemics and have more subtypes, while influenza B viruses have fewer subtypes and typically cause milder illness.
What is the difference between Influenza A and Influenza B?
Influenza A and Influenza B are two different types of flu viruses. Influenza A is more common and can infect both humans and animals, while Influenza B mainly affects humans. Influenza A has more subtypes and can cause more severe outbreaks, while Influenza B typically causes milder illness.
What is the difference between flu A and flu B?
Influenza A and influenza B are two different types of the flu virus. Influenza A is more common and can infect both humans and animals, while influenza B mainly affects humans. Influenza A has more subtypes and can cause more severe outbreaks, while influenza B typically causes milder symptoms.
What is the difference between the flu A and B viruses?
Influenza A and B viruses are both types of flu viruses that can cause similar symptoms like fever, cough, and body aches. The main difference between them is that influenza A viruses can infect both humans and animals, while influenza B viruses mainly infect humans. Additionally, influenza A viruses have different subtypes, such as H1N1 and H3N2, which can cause more severe outbreaks compared to influenza B viruses.
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.
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.
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?
What is the difference between Influenza A and Influenza B viruses?
Influenza A and Influenza B viruses are both types of flu viruses that can cause similar symptoms. However, they differ in their genetic makeup and the strains they can produce. Influenza A viruses are more common and can infect a wider range of animals, including humans, birds, and pigs. They are also known to cause more severe outbreaks and pandemics. In contrast, Influenza B viruses mainly infect humans and typically cause milder illness compared to Influenza A.
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.
