and corals, combined with correct climatic conditions, are ad- 

 mirably suited to tick infestation (cf. page 1^5), but Duruma 

 sandstones, grits of the karroo, and limestone and shale areas 

 are less stiitable. Many huts seem to have been infested by 

 visitors traveling from infested areas with blankets (cf . pages 

 145 and 180) for social purposes, funerals, shopping, and during 

 troop movements. 



One of the most interesting aspects of this study is the cor- 

 relation of infestation with definite climatic conditions. The 

 coastal area, with over fifty inches of rainfall annually and with 

 average hut floor RH of 88$ and temperature of 77.8°F., is almost 

 entirely devoid of ticks. Infested areas are those with thirty 

 to fifty inches of rainfall annually and with hut floor RH aver- 

 aging 83.3$, apparently the optimum for the tampan (consideration 

 of ticks above the floor level, in niches with different RH, or 

 seeking certain conditions with greater or lesser RH within the 

 huts is not attempted). The tick-free hinterland receives about 

 35 inches of rainfall annually; here the hut floor RH is 79% and 

 the average temperature 78.4°F. (cf. pages 137,156 and 157). 



Clearly, this study represents the first generalized attempt 

 to correlate tick infestation with climatic factors and tribal 

 customs and habits. The incidence of spirochete- infected ticks 

 is also noted. It should be of some significance to determine 

 just how far ticks will endeavor to seek out niches with varying 

 microclimates in an infested strticture and what the optimum and 

 threshold conditions are. 



TEI^EIRO (1955). Mozambique. Review of previous reports from 

 colony. 



SCHULZE (1955). Discussion of metabolic products. 



LOVETT (1956). Somaliland. Summary: "Tick-borne relapsing fever, 

 formerly common, has been eradicated in the Somaliland Protectorate 

 by planned and systematic destruction of the vector, 0. moubata, by 

 a programme of spraying of all human dwellings with a water dis- 

 persible preparation of gammexane (P. 520). The last indigenous case 

 was seen in September, 1952. It is considered that the danger of 

 reintroduction of the disease is small as 0. moubata tend to pass 

 their lives in or near their hatching place, with little tendency 

 for dissemination, so that they are unlikely to become re-established 



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