what is the difference between swine flu and influenza type a?
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What is swine flu? Swine flu, also known as 2009 H1N1 type A influenza, is a human disease. People get the disease from other people, not from pigs. The disease originally was nicknamed swine flu because the virus that causes the disease originally jumped to humans from the live pigs in which it evolved.
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In general, current flu vaccines tend to work better against influenza B and influenza A(H1N1) viruses and offer lower protection against influenza A(H3N2) viruses.
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Influenza is caused by infection of the respiratory tract with influenza viruses, RNA viruses of the Orthomyxovirus genus. Influenza viruses are classified into 4 types: A, B, C, and D. Only virus types A and B commonly cause illness in humans.
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While the influenza virus is wholly contained in the lungs under normal circumstances, several symptoms of influenza are systemic, including fever, headache, fatigue and muscle aches.
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“Because pneumonia is a lung infection, it typically has more respiratory symptoms, while the flu is accompanied by muscular aches and pains and fatigue,” she explains. The flu usually comes on suddenly, while pneumonia takes longer to develop and can be a complication from the flu.
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H1N1 flu is caused by a new virus that is different from the seasonal flu we usually see each fall and winter. The virus that causes the seasonal flu changes a little bit each year, but the changes are small and people have some resistance to the virus.
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The flu shot protects against influenza, which isn't the same thing as the stomach flu (gastroenteritis). Gastroenteritis is an infection caused by a variety of viruses, including rotaviruses and noroviruses. Although it is often called the stomach flu, gastroenteritis is not caused by influenza viruses.
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Although some people may refer to norovirus as “stomach flu,” it isn't technically the flu. It's a quick yet uncomfortable bout of gastrointestinal illness. Influenza, on the other hand, is an infection of the respiratory system that may take more time to surface — and, depending on its severity, to shake off.
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Influenza features many of the same symptoms as viral infections like URIs, in addition to body aches and a more severe fever. However, influenza, as opposed to most URIs, can be treated using antiviral medicines, as long as the virus was detected within the first 48 hours.
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A novel influenza A virus is one that has caused human infection, but is different from current seasonal human influenza A viruses that circulate among people. Novel influenza A viruses are usually influenza A viruses that circulate among animals.
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With a weakened immune system, your body may not be able to get over the foreign bacteria and viruses. This is how those with influenza can easily turn their flu into something much worse — pneumonia. Pneumonia is an infection that causes inflammation in the lungs.
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Two flu strains, peaking at different times At the start of the 2018-2019 flu season, the dominant circulating strain of virus was A(H1N1), and the flu vaccine was well matched to it. The more virulent strain, A(H3N2), was present at a low level until mid-January, when its incidence started sharply increasing.
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Rapid Influenza Testing The diagnostic accuracy of influenza swabs is often overestimated by clinicians. The CDC notes that rapid influenza testing has a sensitivity ranging from approximately 50% to 70% — meaning that in up to half of influenza cases, the flu swab results will still be negative.
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The incubation period of influenza is usually two days but can range from one to four days. What are the symptoms of influenza? Typical influenza disease is characterized by sudden onset of fever, aching muscles, sore throat, and non- productive cough.
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"One does not increase or decrease the spread of the other, but it's quite common to see late-season surges like we're currently seeing." While the symptoms of influenza B mirrors those of influenza A, the main difference between the two strains is who it can affect.
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What Is Type B Flu Virus? Unlike type A flu viruses, type B flu is found only in humans. Type B flu may cause a less severe reaction than type A flu virus, but occasionally, type B flu can still be extremely harmful. Influenza type B viruses are not classified by subtype and do not cause pandemics.
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Flu generally starts more suddenly and severely than a cold, with a higher fever and chills. A child with the flu feels much more achy and uncomfortable. A child usually has a cold for 3-10 days. The flu lasts 7 to 14 days and symptoms may linger for up to 3 weeks.