Question

Question VIII. Reasons complicating the development ofvaccines to combat chronic diseases include [complete the sentenceand assess each subsequent statement (63- 67) as either factuallycorrect (= “true”) or incorrect (= “false”)]:
63. evasion of the host’s immune system by the pathogen.

64. the polymorphic diversity of MHC class I and class IImolecules.
65. the generation of inappropriate immune responses that do noteradicate the pathogen.
66. survival of the infectious agent for long periods inside thehost.
67. high mutation rates in the pathogens.