COMMON COMMUNICABLE DISEASES. 



mucous membrane that lines the intestine. In 

 this position they suck the blood of their victims. 

 A pronounced anaemia, of course, follows. 

 This is one S3miptom found also in malaria. The 

 Plasmodium malariae causes anaemia by its 

 power to destroy the red corpuscles of the 

 blood. The germs of the uncinaria duodenalis 

 enter the body in drinking water or from hands 

 that have become soiled with dust containing 

 the parasites. They are also said to be able 

 to gain an entrance through the skin from 

 whence they are carried by the blood into the 

 right side of the heart and to the lungs. 

 From the pulmonary blood-vessels they are 

 thrown into the air spaces and carried upward 

 to the bronchial tubes, larynx and into the 

 oesophageal tract; then they are swallowed and 

 finally pass into the stomach and gain their 

 camping ground, the intestine. The disease 

 this micro-organism produces is frequently 

 fatal. Diagnosis is made by examining a small 

 particle of feces under the microscope. 



Cerebro-Spinal Meningitis is caused by The Germ a 

 the diplococcus intracellularis meningitidis. 'P ococcus. 

 It is not communicated from the sick to the 

 well in the same manner in which most com- 

 municable diseases are, and the germs are not 

 found in the excretions unless there are lesions 

 formed either of the brain or spinal cord. The 

 exact method by which the germs enter and 

 9S 



