It would be nearly impossible to catch a STI from a swimming pool.
It is possible if you have an open wound and in this case bacteria may enter into your body and cause infection of this type. Yes,it is possible.
Yes, you can go swimming in a public pool or lake if you have cellulitis. But it is even better for your cellulitis if you go swimming in the ocean, because the salt helps to disinfect the cellulitis...
no. that's almost as easy as getting pregnant from kissing
Depending on the quality of the bacterial control in the pool, it is technically possible.