you've asked questions like this several times now. please keep them all in one post instead of making a new one each time. we ask this in our read before posting post on the forum.
we call them std's because it takes sexual type contact to contract them. if you aren't having sex, you aren't at risk for a std.
grace
Hello
You can get a lousy nighttime rest in an old mattress (with or without stains).
You cannot get any STDs from the exposure you describe.