Immunological events following an infection by influenza.

Authors Avatar

Keval Varia                                                                                                                  Biology

Immunological events following an infection by influenza

Influenza, also known as the flu, is a contagious disease that is caused by the influenza virus. It attacks the respiratory tract in humans (nose, throat, and lungs). The flu is different from a cold and symptoms may include fever, headache, tiredness, dry cough, sore throat, nasal congestion and body aches. These symptoms usually occur 4 days after being infected by the flu virus. Most people who get influenza will recover in one to two weeks, but some people will develop life-threatening complications (such as pneumonia) as a result of the flu. Influenza usually peaks in the winter months. The flu virus is spread in the droplets released when a person coughs or sneezes hence why it is very contagious.

There are three types of the virus, influenza A viruses infect  and , whereas the Influenza B and C viruses infect only humans.The A type of the influenza virus is the type most likely to cause  and , due to the fact that the virus can undergo , this is when two strains of the virus combine to form a new strain with a combination of the antigens on its surface. The virus can also mutate naturaly in an attempt to resist the bodies defences such as the human immune system. Populations tend to have more resistance to influenza B and C because they cannot change by antigenetic shift and can only change by natural mutation, therefore influenza B and C is usualy similar to its predacessor and similar enough too be destroyed the immune sytem.

Join now!

The virus is a globular protein surrounded in a lipid bilayer. Inside the bilayer are 500 molecules of hemagglutinin, 100 molecules of neuraminidase, some 3000 molecules of matrix protein and 8 pieces of RNA. Each of the 8 RNA molecules is associated with many copies of a nucleoprotein and several molecules of three different RNA polymerases.

When the virus enters the body through the respiratory tract of a person, the hemagglutinin molecules bind to carbohydrates on the glycoproteins of the epithelial cells .The virus is then engulfed into the host cell by receptor mediated endocytosis. The RNA of the virus ...

This is a preview of the whole essay