what is the difference between flu a and flu b 2018?
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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 symptoms you should not ignore. Most cases of the flu are a nuisance – you'll be on your back for a few days or weeks, and then you can return to your normal routine. But certain flu symptoms, like sudden dizziness, may signal a more serious medical problem, like sepsis or pneumonia.
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After the 2009 pandemic, several U.S. studies among 2 through 17-year-olds found that the nasal spray vaccine was effective against influenza B viruses, and was similarly effective against H3N2 viruses as inactivated influenza vaccines, but was less effective than inactivated influenza vaccines against the 2009 ...
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— Pooled data confirms vaccine's lower effectiveness, especially against H1N1 strain. Live attenuated influenza vaccine (LAIV4), or FluMist, was less effective at preventing flu, especially influenza A/H1N1, in recent flu seasons among kids than inactivated influenza vaccine (IIV) was, researchers found.
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The injected flu vaccine given to adults contains inactivated flu viruses, so it cannot give you flu. The children's nasal spray flu vaccine contains live but weakened flu viruses that will not give your child flu.
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In response to the identified strains, there are two common vaccinations available each year: Trivalent — this vaccine protects against three strains of the flu: two A strains and one B strain. The trivalent vaccines have traditionally been the most popular and affordable flu vaccine.
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Each year's flu vaccine is made to give the best protection against the strains of flu that are expected to circulate in the coming season. The trivalent vaccine protects against three of the flu virus strains which are most likely to be around. The quadrivalent vaccine protects against four flu virus strains.
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Most flu vaccines in the United States protect against four different flu viruses (“quadrivalent”); an influenza A (H1N1) virus, an influenza A (H3N2) virus, and two influenza B viruses.
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Real flu (influenza) affects only your respiratory system — your nose, throat and lungs. Gastroenteritis, on the other hand, attacks your intestines, causing signs and symptoms, such as: Watery, usually nonbloody diarrhea — bloody diarrhea usually means you have a different, more severe infection.
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Flu vaccines also have reduced the risk of flu hospitalization among adults age 65 and older by 54% against A(H1N1) viruses and by 31% against influenza B viruses on average (2). However, protection against influenza A(H3N2) flu viruses has been less consistent.
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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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Early signs of the flu include: fatigue. sudden fever (usually above 100°F [38°C]) scratchy or sore throat.
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The big difference between flu and RSV is the way symptoms begin. The flu usually starts with a high fever along with aches and pains. RSV starts out as a cold -- sometimes with fever -- but mainly a cold that leads to coughing, fast breathing and wheezing.
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In the past, it was thought that infection with influenza A was more severe than infection with influenza B. However, a 2015 study in adults with influenza A and influenza B found they both resulted in similar rates of illness and death.
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The 2017-2018 flu shot offered just 25 percent effectiveness against the predominant strain of flu that season, H3N2. But this year's shot offers 47 percent protection against all circulating strains, according to researchers at the U.S. Centers for Disease Control and Prevention.
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While influenza, more commonly known as 'the flu' and norovirus can occur simultaneously, the two viruses are very different. The norovirus infection affects the stomach and appears as more of a “stomach bug.” Signs and symptoms include a sudden onset of vomiting and/or diarrhea with cramps.
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Flu (influenza) viruses are divided into four broad categories: influenza A, B, C or D. Influenza A is the most common type. H1N1 flu is a subtype of influenza A. Subtypes of influenza A are categorized based on two proteins on the surface of the virus, hemagglutinin (H) and neuraminidase (N).