4. i believe it progresses through your respiratory system. i could be wrong though.
5. people infected with the novel corona virus can have markedly different experiences. Some report having nothing more than symptoms of a mild cold; others are hospitalized and even die as their lungs become inflamed and fill up with fluid.
6. a vaccine can help to build up antibodies similar to the ones needed for corona virus. so if your boy can remember ones similar to it, it won't have to work as hard
