So my sisters bf told me that all vaccines of any kind after you get it you do something called shedding where your body lets out whatever was in the vaccine or something like that. Anyone know what hes talking about?
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For the coof vaccine; no, can't shed it since it has no active viral components. My understanding is that it tricks protein factories in your bodies in printing out what are essentially the signature of the virus, so your white blood cells react on it without a viral component ever being active.
Vaccine shedding only happens with live-virus vaccines. it is, all by all, a massive public health concern, which is why vaccines are tested for shedding capabilities ever since the oral polio vaccine was shown to have this issue.
Though shedding in minor forms is relatively common (live viral vaccines show up in nasal excretions for a few days after injection for around 70% of cases), for the most parts its utterly ineffectual to non-immunocompromised individuals, because the live viral strain used in a vaccine is already heavily weakened.