All of the following statements about polioviruses are correct except _____. a. Poliovirus vaccines are produced in both inactivated and live-attenuated forms. b. The oral poliovirus vaccine is composed of three liveattenuated viral strains. c. Poliovirus infects both humans and cattle. d. If genetic reversion of strain 3 occurs when the virus is replicating in vaccinated people, pathogenesis may occur. e. In the United States, the recommended vaccine for poliovirus is the inactivated poliovirus vaccine (IPV).

An enveloped virus has a __________ time hiding from the host human immune system and is _________ off in the outside environment, when compared to a naked virus. Select one: a.Worse/Better b.Easier/Better c.Easier/Worse d.None of the Above e.Worse/Worse

Describe a drug therapy that has been used for patients infected with SARS CoV2.  What does it target/disrupt – a part of the virus itself, a viral process, the host immune response?

19. The following event does not occur in the germinal centers of activated B cells? A. somatic hypermutation. B. formation of memory B cells C. RNA recombination D. plasma cell formation 20. Features of T-independent immune response include? A. occurs in people that lack a functional thymus C. give rise to memory cells. 21 Thafall E. class switching B. production of IgG and IgA D. involve immunological synapse