| abortive measles virus | 缺损麻疹病毒 |
| acidosis | 酸中毒，酸血症 |
| acquired immune deeficiency syndrome(ALDS) | 获得性免疫缺损隐综合征（艾滋病） |
| acute lymphadenitis | 急性淋巴结炎 |
| acute myelitis | 急性脊髓炎 |
| acute polyneuroradiculitis | 感染性多发性神经根炎 |
| acyclovir | 无环鸟苷 |
| adenosine arabinoside(Ara—A) | 阿糖腺苷 |
| adherence factor | 粘附因子 |
| agglutination test | 凝集试验 |
| alanine aminotransferase(ALT) | 丙氨酸转氨酶 |
| albumincytological dissociation | 蛋白细胞分离 |
| allergy | 变态反应 |
| alternative pathway | 替代途径 |
| amebic dysentery | 阿米巴痢疾 |
| amebiasis;amebosis | 阿米巴病 |
| ameboma | 阿米巴瘤 |
| amodiaquine dihydrochloridum | （二）盐酸氨酚喹啉 |
| amoeba histolytica | 溶组织阿米巴 |
| amoebic liver abscess | 阿米巴肝脓肿 |
| amoxicillin | 羟氨苄青霉素 |
| amphoterincin B | 两性霉素B |
| ampicilln | 氨苄青霉素 |
| anaerobic bacteria;anaerobe | 厌氧菌 |
| anoxemia | 缺氧血症 |
| anoxia | 缺氧 |
| ansamycin | 袢霉素 |
| anthrax | 炭疽 |
| antibiotic | 抗生素 |
| antibody | 抗体 |
| antibody dependent cell-mediated cytotoxicity | 抗体依赖细胞介导的细胞毒 |
| antigen | 抗原 |
| antigeic drift | 抗原漂移 |
| antigenic shift | 抗原转移 |
| antioxin | 抗毒素 |
| apparent infection | 显性感染 |
| arachidonic acid | 花生四烯酸 |
| Ascoli’s test | 炭疽环状沉淀试验 |
| asphyxia | 窒息 |
| aspiration of sputum | 吸痰 |
| atypical form | 非典型型 |
| atypical measles | 异型麻疹 |
| autoimmunity | 自身免疫 |