26．人类免疫缺陷病毒的主要致病机理为破坏

A．CD4+T细胞                                        B.CD4-T细胞

C.CD8+T细胞                                           D.CD8-T细胞

27．HAV的血清型别有

A．1个                                                    B.2个

C.3个                                                       D.24个

28．下列哪种病毒为缺陷病毒

A．HAV                                                    B.HBV

C.HCV                                                      D.HDV

29．内基小体是

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

C.疱疹病毒包涵体                                    D.狂犬病毒包涵体

30．下列哪种病毒只具有蛋白质结构

A．类病毒                                                B.朊粒

C.腺病毒                                                  D.痘病毒