CHAPTER XI 



PNEUMONIA, INFLUENZA, AND COLDS 



Pneumonia 



PNEUMONIA is an inflammation of the 

 lungs, and is usually incited by bacteria. 

 The species which is the most common in- 

 citant of the disease in grown people is called 

 Pneumococcus. But in children and some- 

 times in adults the pyogenic bacteria, which 

 we have looked at in a former chapter, and 

 other forms are also frequently at work. 



You see that here in pneumonia we have 

 a disease which, unlike tuberculosis and 

 typhoid, may be induced by any one of 

 various forms of germs and not infrequently 

 several forms act together. 



In the most common type of pneumonia 

 in adults the bacteria almost always get 



"5 



