Wrt covid vaccines: Supposing a doctor gets vaccinated and his family didn’t get it. If he is exposed, then he is protected but he can still transmit it to his family, yes?
A vaccine generally doesn’t just prevent symptoms, but prevents the infection. Of course, if the disease were like, on their hands because they were touching stuff, and then they put those hands in someone else’s mouth, they that could be a means by which the someone else could be infected, just like if it were on some inanimate object rather than someone’s hands,
But, a vaccine that works, should at the least reduce how much the disease is able to use a person’s body to reproduce. So, it should at the least reduce the time during which, and the extent to which, a person would be infectious.
Right?
I don’t see how it could be otherwise while still being a functional vaccine.