My 16 year old tested positive monday. She hates going out, (she us autistic) and over summer when she hasnt HAD to go out she has been in her room practically isolating anyway 
Everyone else in the house was negative monday but today my 5 year woke up with a high temp and had s positive lft (im assuming the pcr will be positive too) .
It seems that the 16 year old picked it up first but i really cant think how!!