Regarding; ''If the virus mutates in a way that changes the antigen, this means the new mutated virus may not be recognized by the antibodies produced against the original version of the virus'' Natural Immunity will take care of that...I wouldn't worry about too much.
Regarding; ''If the virus mutates in a way that changes the antigen, this means the new mutated virus may not be recognized by the antibodies produced against the original version of the virus'' Natural Immunity will take care of that...I wouldn't worry about too much.