Hashishi

i recently found out one of the people i've been smoking with (passing joints with) is living with full blown aids.

i'm not naive and am well aware that the chances of being infected through passing a joint are miniscule...but that doesn't quite sate my paranoia, so i thought i'd bring my question before the cannabis council and seek your guidance.

i'm thinking of getting tested just to put my mind at ease...but is it really worth it? how long would i have to wait before the tests could detect anything? what are the chances/how could one become infected through passing a joint?

i did a search but found nothing specific to my queries.

my thanks in advance.