Dina
                    
                    
                    
                    
                    
                    
                    
                        
                        
                        are there many "strange types"  of pnuemonia that are difficult to diagnose?  dad is coughing constantly and no one can find out why.   Doctors are very confused. tests are coming back negative  for major diseases and prednisone didn't help the inflammation in lungs or the cough to subside...  any ideas??