According to the relevant requirements, the food and beverage service industry to provide food and beverage utensils (including cups) must be thoroughly sterilized. In this case, if you drink from the cups of restaurants and bars, you will not be infected with any disease.

But if the cups are not sterilized, or if they are not sterilized thoroughly, there may be pathogenic microorganisms on the cups, and if they are used for drinking, they may be infected with intestinal infectious diseases (e.g., dysentery, typhoid fever, etc.). As for hepatitis B, it is mainly transmitted through blood, but it is also possible to be infected through the gastrointestinal tract if the susceptible person has an ulcer in the digestive tract.