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People fall sick because of the 'bad' bacteria which infest our bodies. These may spread through coughing, sneezing, etc. Our body has a special system called the 'Immune System'. Just like other organ systems, it has a function, a job to kill all the bad bacteria. Sometimes, it needs to identify the bacteria so the immunity shots we take contains a very weak bacteria of that type to help the immune system recognise the bacteria. Once we get our shot, our immune system recognises the bacteria and starts killing any other which come. This makes us immune to the bacteria or disease.

But sometimes we need to take the other medicines, as the bacteria is producing more very fast, too fast for our immune system to kill all of them. That's why we have the antibiotics, etc. And not all shots are the ones like above, only some are the ones for recognition of the bacteria.

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15y ago

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