Causes of the Flu and Flu Vaccine


Influenza is a highly contagious and common disease caused by the influenza virus. There are two main types of flu viruses: Types A and B, which cause infections in humans.

People can catch the flu at any time of the year, but in most parts of the United States and the Northern Hemisphere the flu season lasts until early spring. Fever activity usually increases from December to March.

People of all ages can get the flu. However, children, the elderly, and people with weakened immune systems or chronic medical conditions are at higher risk and more likely to develop serious complications.

Causes of the Flu

The flu virus has different strains and is often mutated. This is why people get the flu year after year. Fever is a highly contagious disease. Coughing and sneezing are strong enough to transmit water droplets through the mouth and nose. You can also get the flu by touching personal contacts (washing or hugging), salting (kissing or sharing a drink) and contaminated surfaces (doors or fuses).

The virus is spread when another person breathes in those droplets or touches a contaminated object and touches their nose, mouth or eyes.

What to expect

Symptoms can last anywhere from two to seven days, but the flu usually lasts four to five days.

  Some flu symptoms may be similar to cold symptoms: 3


  • Muscle or body aches
  • a cough
  • Nose or stuffy nose
  • Itchy or watery eyes
  • Sore throat
  • Fatigue
  • Low fever

However, the main difference between cold and flu symptoms is severity

The common cold starts slowly in a few days and gradually worsens. Symptoms can make you feel pretty bored, but they are usually not severe enough to disrupt your life. The flu strikes you at once and wipes you out completely.

Common symptoms of fever 8 include:


  1. Bamboo
  2. Management Headache
  3. Body aches
  4. Excessive fatigue

Influenza a

Influenza is a virus that has hundreds of different strains. The virus is often mutated, but the virus is classified into one of three types - A, B, or C. Influenza is one of the most common causes of illness in humans.

All influenza A viruses are further subdivided into H and N subtypes. There are 18 H groups and 11 N subtypes, but only three combinations actually cause highly contagious diseases in humans. Other combinations have been found to infect other species (such as birds and igs gold) but they have not been widely transmitted to humans. The three compounds that cause the flu to spread in humans are H1N1, H2N2 and H3N2.

Even in these subtypes, the influenza virus mutates and changes from year to year. Influenza viruses are also named for this reason:

  • Host of origin (ine gold, chicken, etc., or no host if it is of human origin)
  • Geographical location of origin (Hong Kong, Alberta, etc.)
  • Strain number
  • Year of discovery (or isolation)
When the Centers for Disease Control and Prevention in the United States and the World Health Organization name a new source of influenza virus, list them (A, B, or C) by group, then host, starting point, Victoria number, year. HN subtype in findings and parentheses.

History of Influenza a

Influenza A virus has caused all the major flu epidemics in modern history. The 1918 epidemic was also known as the Spanish flu. It was caused by the H1N1 virus.11 The 1957 flu epidemic, also known as the Asian flu, was caused by the H2N2 virus. The 1968 epidemic - also known as the Hong Kong flu - was caused by the H3N2 virus. 12 Finally, the 2009 pandemic - also known as swine flu - was caused by the H1N1 virus.

Influenza A in flu shots

The seasonal flu vaccine usually has two strains of influenza A and one strain of influenza B.
The seasonal flu vaccine usually contains two different strains of influenza A and one or two strains of influenza B.13.


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