A: We are trying to study proteins on the surface of HIV, trying to attack it with immune system antibodies or with cell responses, certain types of killer cells or cytotoxic cells that would attack the virus itself or virus-infected cells.
答：疫苗的原理是促使免疫系統分泌抗體或有殺傷力的細胞，以抵抗侵入人體的病毒或攻擊被病毒感染的細胞。