Most people don't have any symptoms, but they can still infect other people through sexual contact.
        
             
        
        
        
Fun fact: i don’t think any of us asked
        
                    
             
        
        
        
Answer:
Playing video games, including violent shooter games, may boost children's learning, health and social skills, according to a review of research in American Psychologist. The study comes out as debate continues among psychologists and other health professionals regarding the effects of violent media on youth.
 
        
                    
             
        
        
        
Cardiovascular system: arteriosclerosis 
digestive system: cirrhosis 
endocrine system: addisons disease
immune system: mononucleosis