Nearly everyone has probably caught the flu at some point, and anyone who catches the flu gains resistance immunity against the virus that caused the illness. The H1N1 flu strain that emerged in spring of was caused by a completely new virus that had never spread before.
Because of that, no one is thought to have any resistance to this virus. The main symptoms of the new H1N1 flu strain are as follows: They are nearly identical to those of seasonal flus. Symptoms include sudden fever and coughing, a sore throat, and fatigue. A runny nose, stuffed nose, and headaches may also be present. Some people also experience gastrointestinal symptoms, such as nausea or diarrhea.
This is thought to be one of the ways it differs from seasonal flus. Most people experience a mild illness for several days and then recover. Swine influenza is a respiratory disease of pigs caused by type A influenza viruses that regularly cause outbreaks of influenza in pigs.
The main swine influenza viruses circulating in U. CDC works to improve global control and prevention of seasonal and novel influenza, including swine influenza viruses, and works to improve influenza pandemic preparedness and response. CDC has partnered with the U.
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Sign up now. Answer From Pritish K. Tosh, M. Show references Types of influenza viruses. The H1N1 flu virus strain is included in the seasonal flu vaccine, including the vaccine for The signs and symptoms of flu caused by the H1N1 virus are similar to those of infections caused by other flu strains and can include:. It's not necessary to see a doctor if you're generally healthy and develop flu signs and symptoms, such as fever, cough and body aches.
Call your doctor, however, if you have flu symptoms and you're pregnant or you have a chronic disease, such as asthma, emphysema, diabetes or a heart condition, because you have a higher risk of flu complications. If you have emergency signs and symptoms of the flu, get medical care right away. For adults, emergency signs and symptoms can include:. Influenza viruses such as H1N1 infect the cells that line your nose, throat and lungs.
The virus enters your body when you inhale contaminated droplets or transfer live virus from a contaminated surface to your eyes, nose or mouth. If you live in or travel to an area where many people are infected with the H1N1 virus, you may be exposed to the virus.
Each year's seasonal flu vaccine protects against the three or four influenza viruses that are expected to be the most common during that year's flu season. The flu vaccine can reduce your risk of the flu and its severity and lower the risk of having serious illness from the flu and needing to stay in the hospital.
Flu vaccination is especially important in the flu season because the flu and coronavirus disease COVID cause similar symptoms. Preventing the flu and reducing the severity of flu illness and hospitalizations could also lessen the number of people needing to stay in the hospital.
The flu vaccine is available as an injection and as a nasal spray. The nasal spray is approved for use in healthy people ages 2 through 49 years old. The nasal spray isn't recommended for some groups, such as pregnant women, children between 2 and 4 years old with asthma or wheezing, and people who have compromised immune systems. For example, you may need to practice social distancing physical distancing and stay at least 6 feet 2 meters from others outside your household.
You may also need to wear a cloth face mask when around people outside your household. Mayo Clinic does not endorse companies or products.
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