Answer:
Corona effects our body as a typical cold would, and varies with if you have any underlying health conditions or not. The typical symptoms are that of your common cold. 
Explanation:
 
        
             
        
        
        
The structure that forms cranial nerve I is the olfactory nerves while forming the 2nd is the optic nerve. Together with retina and olfactory epithelium, all of them are considered part of the Central Nervous System — wherein they synapse directly to the brain without the aid of any ganglia.