People transmit HIV by having unprotected sex, by receiving infected blood transfusion or, as in Xiaohua's case, through birth.
People transmit HIV by having unprotected sex, by receiving infected blood transfusion or, as in Xiaohua's case, through birth.
人们通过没有预防措施的性生活，通过输受病毒感染的血液传播HIV(人体免疫缺损病毒)，或者像小华的案例，通过出生从母体遗传。