174 



Insects and Disease 



ticular houses, makes a strong case against the bed- 

 bug. Manson, however, believes that the parasite 

 may be transmitted by other agents also, possibly 

 by means of flies that visit the sores or in other 

 ways. 



ORIENTAL SORE 



This disease, once supposed to be confined to the 

 Orient, is now found to be rather widely distributed 

 throughout the tropics, where it is sometimes very 

 prevalent. It is caused by the presence in the 

 system of a parasite very similar to or identical 

 with the one causing kala-azar and is regarded by 

 some as a modified form of that disease. The 

 patient is affected with one or more serious sores 

 or ulcers which usually occur on exposed parts of 

 the body. 



The parasite that causes the disease is supposed 

 to be carried by insects either directly or indirectly. 



In the latter case the insect may act as an inter- 

 mediate host. 



Dogs and camels are also attacked by this disease 

 and may be sources of infection. 



