HIV infection in the air lasts only a few minutes.

Unless, of course, someone just left and your friend is sitting there.

……

Tetanus? The pin wound won't be that deep, will it? Tetanus is an anaerobic bacterium. If the wound is not deep, it will not be infected.

Of course, it is safest to go to the hospital for a check-up.

I feel like I'm talking nonsense ...