why vaccine for covid-19 is difficult to prepare and taking so long
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The development of any vaccine can be compared to a long and challenging marathon with an uncertain outcome – and that is especially true when dealing with a new pathogen.The purpose of a vaccine is to expose the body’s immune system to some portion of the virus so it can prepare in advance for a real attack. For instance, a vaccine might include an antigen, or protein, from the surface of the virus. But finding the antigen that will trigger an effective immune response is easier said than done. PLZ MARK ME AS BRAINLIEST ANSWER
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it is a very dangerous virus and the time is very less for scientist to prepare the vaccine but they are making it the countries like america Britain and china
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