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[–] PewterKey ago 

As it mutates more the effectiveness of antibodies or a vaccine will drop against all strains (like influenza where strains have many mutations between them). But right now COVID19 has 3 very closely related strains, so it might not be perfect immunity but your body won't be caught off guard if hit again by a different strain. Each new strain will push towards common cold levels of illness, becoming a less dangerous and shorter illness.