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Chapter XXII I 

 TO MAKE A MALARIAL SURVEY 



Endemic Malaria 



The clue to the epidemiology of malaria in 

 the tropics is to be found in the infection of the 

 native population of a country. The malaria of 

 Europeans is merely the result of their exposure 

 to infection from this source. Investigation into 

 the natural history of malaria, therefore, resolves 

 itself largely into the study of native or endemic 

 malaria. It has always been recognized that in 

 a particular country certain districts are more 

 malarial than others. It was not,. however, till 

 Koch used the percentage of infected children as 

 the test of the malarial intensity of a place that 

 accurate measurement of this became possible. 



To Investigate the Endemic Malaria of a 



District 



(A) The Breeding -Places of Anophelines — 



I. Examine all collections of water within 

 half-a-mile. Stir up the mud of small puddles, 

 and use a dipper where the water is weedy or 

 difficult of access. Examine wells, ' chatties,' 

 streams, and swamps, as well as pools of every 

 description. Take specimens of larvae from each, 

 placing in specimen tubes and labelling. 



