Covid shedding is different than other vaccine shedding but it is a thing. People shed virus after being recently vaxxed. In fact, some cancer wards forbid recently vaxxed people from visiting patients because they will shed virus on immunocompromised cancer patients. Or at least, this used to be the case pre covid. I cannot find the links anymore because everything is covid, covid, covid and now they tell the immunocompromised to take the vaccines. That will kill a lot of those people.