FIELD AGENT GRAY'S POSTER 



MALARIA 



Malaria is caused by a microscopic organism in the blood, 

 introduced into the human body by the bite of a certain species 

 of mosquito (Anopheles mosquito) which breeds in still water, 

 preferably in grassy marshes having a few inches of standing 

 water. 



The malaria-bearing mosquito is seldom found more than ioo 

 yards from the place where it is bred. 



Malaria Can be Prevented by the Following Measures 



i. Drain all damp areas where possible, especially such as are 

 grass covered. You will not only remove a possible source of 

 infection but will increase the value of such land. The drainage 

 ditches should be given as much and as even slope as possible, 

 and should have clean, straight banks with a berm. Tile drains 

 are the most effective, but are more expensive than open drains; 

 they are, however, well worth the extra initial cost. 



2. Standing pools of water which can be more easily filled than 

 drained should be filled with earth to the surrounding surface 

 level. 



3. Stop at once any and all breaks in irrigation ditches and 

 water pipes. Such breaks very often cause pools or marsh most 

 favorable to the breeding of the malaria-bearing mosquito. 



4. Large ponds and streams which exist throughout the year 

 will not breed mosquitoes if stocked with minnows, sticklebacks, 

 etc., which eat the larvae, or young mosquitoes. 



5. Clean up your premises. Clear away all brush within 

 100 yards of your house. Do not allow standing water to remain 

 in tubs, buckets or old tin cans. 



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