I wonder is there any chance we can have dangerous contagious disease, such as HIV, herpes, hepatitis, etc via sharing thing with other people?
As I go to fitness center, I share the gym equipment, towel, bath room, steam and sauna room, swimming pool with other people.
If for example, there is a dry blood stain on towel, is it possible to get infected?
HIV will not transmit via sharing things. Except for occasions, such as sharing syringe needles, sharing unmaintained medical equipment.
HIV doesn't always survive in dry blood. (see this AIDS Map article)
Hepatitis does (See this also). So avoid any blood possible. Hepatitis can survive outside human body for up to 7 days. They are tough bugs. They transmit via blood and body fluids
Herpes does transmit via object, but it will not transmit if you touch it by hand. However they will transmit via mouth and genital parts.
