C ．包膜抗原                                                          D ．包涵体

26 ．病毒侵入机体后，最先诱导产生的具有抗病毒作用的物质是 (       )

A ． IgM                                                                  B ． IgG

C ．干扰素                                                              D ． SIgA

27 ．沙眼的主要传播途径是 (      )

A ．口到眼                                                              B ．血到眼

C ．手到眼                                                              D ．泌尿生殖道到眼

28 ．支原体与细菌的主要不同点是 (       )

A ．无细胞壁                                                          B ．对抗生素不敏感

C ．可在培养基上繁殖                                            D