| B C 3 | | 1981 1983 | HIV | | | | | B | B B | B | | | C C | 3% | B C | | 1 | B C | | 2 | | | B C | | | | 3 | B C | | | | | ① | | ② | | ③ | | ④ | ⑤ | | | | B | B | B | | | B C | | | | B | C | B C | | | |