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The world now has hundreds of different vaccines and protection methods against different viruses, but most people do not know how scientists manufacture those vaccines. The first thing that needs to be done to create a vaccine is to make a weakened or inactive version of a virus. Once scientists have that weakened or inactive version, it can now be injected into the human body. How it works is that if a virus is in a weakened state, it cannot replicate enough to do any harm to the host, but the human body will still acknowledge that a virus is there. In so doing, the body will send the natural antibodies to kill the virus inside the body and they will stay there, preventing future infections of that virus. In the case of the inactive versions, the virus will be injected into the human but will not replicate at all, but the body will recognise it and defeat it the same way that was mentioned earlier, allowing for future immunity. Examples of vaccines with weakened versions of a virus include measles, mumps, German measles, rotavirus, oral polio, chickenpox, and influenza. Finally, examples of inactive virus vaccines include polio, hepatitis A, influenza, and rabies. There are some benefits to using an inactive form of a virus for a vaccine. Firstly, the vaccine cannot cause even a mild form of the disease that it prevents. Secondly, the vaccine can be given to people with weakened immune systems.
