@mister.nour: During a viral infection, viruses inject their genetic material DNA or RNA into a host cell. In doing so, they reprogram the metabolism of the host cell so that it produces viruses from its own cell material. Viruses can only reproduce in the host cell, they do not have metabolisms, therefore they are not living creatures Bacteriophages infect bacteria. After attaching to it, the virus injects its genetic material into the bacterium which starts producing viruses. "laices start infecting viruses. When released from the dead bacterium, the viruses start other cells. The protein shell of the influenza virus contains RNA, and this protein shell is surrounded by a lipid membrane, which derives from the cell membrane of the host cell. Influenza viruses spread in tiny droplets caused by coughing and sneezing. When reaching the airways they inject their RNA into cells. The host cells then produce viruses, which infect further cells. The infection is usually harmless, but in certain cases it can lead to life-threatening complications. The Spanish Flu epidemic, which killed tens of millions of people around the world after the First World War, was caused by the H1N1 subtype of the Influenza A virus. Vaccination is an effective method of preventing influenza; due to the high mutation rate of the virus it is recommended that vaccinations be repeated every year.

Mr. Nour

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Monday 13 November 2023 15:16:04 GMT