5. List 4 experimental methods that can be used for studying the causes or the mechanisms of mental disorders, such as schizophrenia, and briefly explain their principles(10pts)

1. Covid-19 outbreak has caused not only severe impacts on people's livelihood, but also enormous social and economic disruptions. Please explain (A) the antiviral responses of innate immune system, and (B) the principles of antiviral actions of vaccine (10pts).