Then how did somebody get infected to bring it into the family household?
Then how did somebody get infected to bring it into the family household?
Its a very big household, or its crap research.
Perhaps inviting people over to spend the night or having a date and then going to visit your parents for a weekend.
All such laisons are intimate; close friends, extended family eating together or friends watching a movie in an enclosed space or even just making out.
Welcome to the beginning of generation EC: Epidemiology-Contagion.