Exposure occurs whenever the blood, semen or vaginal secretions of a HIV+ person comes into contact with a mucus membrane (the linings of the anus, vagina, mouth, or urethra) or get under the skin through a cut or tear

• 当爱滋病毒感染者的血液、精液或阴道分泌物接触他人的粘膜（肛门壁、阴道壁、口腔壁或尿道壁）或通过伤口进入皮下，就会产生感染风险