26．人類免疫缺陷病毒的主要致病機理為破壞

A．CD4⁺T細胞                                        B.CD4^-T細胞

C.CD8⁺T細胞                                           D.CD8^-T細胞

27．HAV的血清型別有

A．1個                                                    B.2個

C.3個                                                       D.24個

28．下列哪種病毒為缺陷病毒

A．HAV                                                    B.HBV

C.HCV                                                      D.HDV

29．內(nèi)基小體是

A．麻疹病毒包涵體                                  B.腺病毒包涵體

C.皰疹病毒包涵體                                    D.狂犬病毒包涵體

30．下列哪種病毒只具有蛋白質(zhì)結(jié)構(gòu)

A．類病毒                                                B.朊粒

C.腺病毒                                                  D.痘病毒