The most common charge for intentionally exposing someone to a Sexually Transmitted Disease (STD) or Sexually Transmitted Infection (STI) is assault. In Texas, a person commits assault if they cause bodily injury or serious bodily injury to another.
If the transmitted disease is HIV/AIDs, the charge could be upgraded to aggravated assault with a deadly weapon. According to the Texas Penal Code 22.02, a deadly weapon is anything that can be used to cause death or serious bodily injury. There have been numerous prosecutions in which body fluids such as blood, saliva and semen have been alleged as deadly weapons.