The purpose of a 'vaccine' is to prevent/protect from the disease. Post vaccination, the person vaccinsted cannot get the disease. The purpose of an experimental drug using mRNA is ??? I don't know. The reason why it may be possible to become reinfected is because the experimental drug using mRNA technology is NOT a true vaccine. It alters or has the potentisl to alter RNA/DNA- you know, THE BUILDING BLOCKS OF LIFE. *Ask your friend this question; 'Are you willing to BET YOUR WHOLE LIFE on an experimental drug not tested and approved by the FDA or anybody else, having over 2,000 Deaths in the USA alone, that at some point in the future could alter your RNA/DNA to cause other diseases and premature DEATH, for a virus that has a 97.7% survival rate? The information is all over the internet. Look it up.