RELAPSING FEVER — TRANSMISSION 



45 



In Europfe several different pests are probably implicated in 

 the transmission of relapsing fever. In Persia and neighboring 

 countries the miana tick, Argas persicus (see p. 364, and Fig. 159), 

 is probably the chief offender, while in Russia, Serbia and the 



Fig. 7. Life cycle of Spirochwta gallinarum, applicable also to Sp. duttoni of 

 relapsing fever. A, multiplication by tran-sverse division in vertebrate blood: B, 

 formation of coccoid bodies in vertebrate blood: C, infection of cells of tick and 

 formation of coccoid bodies: D, multiplication of coccoid bodies in tick; E, dc- 

 ^•elopment of spirochaete forms from coccoid bodies after reentering vertebrate 

 blood. X 1500. (After Hindle.) 



Balkan States lice and probably also bedbugs are the trans- 

 mitters (see p. 378). It is noteworthy that relapsing fever al- 

 ways thrives best in those countries where body cleanliness is 

 neglected, and where vermin are in consequence abundant. In 

 fact, the prevalence of relapsing fever in any country, as of typhus, 



