how virus activate in human body ?
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People constantly encounter viruses, bacteria or parasites. Fortunately, our skin, the specialized lining of our guts and other parts of our body that are exposed to the outside world prevent them from entering. When a pathogen breaches this barrier, our body’s defences come into play.
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Viruses are not cell and do not content cell organelles. they are made up of genetic material surrounded by a protein coat. they cannot multiply on their own for this they need to enter a living thing when they entered Then they do not show any characteristic of living things they do not respire grow feed excrete or multiply. Viruses are the smallest of all microorganism much smaller than a bacterium.eg influenza and bacteriophage.
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