l88 PATHOLOGY 



organs sometimes show necrotic foci. The most con- 

 stant and typic complicating lesion is inflammation of 

 the kidneys, scarlatinal nephritis. Streptococci are 

 constantly present in great numbers, and by some 

 are considered to be the cause of the disease. Certain 

 it is that they are the cause of many of the complica- 

 tions, as otitis, mastoiditis, etc. 



Morbid Physiology. The fever, prostration, and gen- 

 eral disturbances are simply characteristic of inflamma- 

 tion. An attack confers immunity, but how it does so 



is not known. 



PAROTITIS (MUMPS) 



Definition. An acute infectious and contagious dis- 

 ease, characterized by swelling of the parotid glands and 

 a liability to orchitis. 



Etiology. The specific cause is unknown. The dis- 

 ease occurs most frequently in childhood and early adult 

 life. 



Morbid Anatomy. There is inflammation of one or 

 both parotid glands, with catarrhal condition of the 

 ducts. Inflammation of one or both testicles may occur 

 and is sometimes followed by atrophy. The mammary 

 glands and ovaries are less frequently involved. 



Morbid Physiology. No specific alterations occur. 



PERTUSSIS (WHOOPING-COUGH) 



Definition. An acute specific affection, occurring 

 usually in children and characterized by a peculiar 

 convulsive cough, ending with an inspiratory whoop. 



