PATHOGENIC BACTERIA 



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organism is transferred in some cases from mother to young. 

 In tropical protozoan diseases, such as nagana and sleeping 





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FIG. 51. Spirochaeta obermeieri of relapsing fever. Williams. 



sickness which are due to trypanosomes, the tsetse flies are 

 factors in the transmission of the disease. These protozoan 

 diseases are transmitted by bites of the flies. 



Bedbugs, common fleas, and lice may also be capable of 

 transmitting certain infectious diseases. Bact. tuberculosis 

 has been found in the bedbug. It has also been stated 

 recently that the louse transmits the microorganism of 

 typhus fever. 



It is also a well-known fact that healthy persons may 

 carry on their mucous membranes such organisms as the 

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