Health in home and town . prevention of malaria, yellow fever, typhoid fever,and small-pox. In order to understand how these dis-eases may be prevented it is necessary to know some-thing of their causes and of their means of spreading. Malaria and the Mosquito. — Malaria is caused by a very small animal or parasite that lives in the blood of the afflicted person. One kind of mosquito, the marsh mosquito, carries this parasite from the sick to the well. In biting a person having malaria, the mosquito sucks in some of these parasites with the blood. Then, when it bites the well person, these par
Health in home and town . prevention of malaria, yellow fever, typhoid fever,and small-pox. In order to understand how these dis-eases may be prevented it is necessary to know some-thing of their causes and of their means of spreading. Malaria and the Mosquito. — Malaria is caused by a very small animal or parasite that lives in the blood of the afflicted person. One kind of mosquito, the marsh mosquito, carries this parasite from the sick to the well. In biting a person having malaria, the mosquito sucks in some of these parasites with the blood. Then, when it bites the well person, these parasites escape into the opening made by the bite. A person with malaria may 261 262 HEALTH IN HOME AND TOWN give it unconsciously to many others if mosquitoes areallowed to bite him. For the prevention of malaria,then, the measures must apply to the persons sufferingwith the disease as well as to the mosquitoes that maycarry it. The Malaria Mosquito. — The marsh mosquito that 1 ~ > ( ( y J M h ^t AJ -$: Jft, V- ^r\. Mosquito Eggs and Larvae carries malaria is large in size and is found in the longgrass on the margins of marshes, lakes, ponds, andrivers. The tiny eggs float on the surface of the waterand soon develop into small larvae about one quarterof an inch long. These lie close beneath the surface,for they must obtain the air above for breathing. Aftera few days they change into another form called thepupa, identified by a very large head. After five orten days changes take place within the pupa, and the THE PREVENTION OF DISEASE 263 adult mosquito escapes from the empty skin. All of theearly life of the marsh mosquito, then, is spent near thesurface of water. Destroying the Mosquitoes. — The mosquito maybe killed by destroying either the early forms or theadult. The fight against mosquitoes must begin bylocating the places where they breed. A search in
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectsanitat, bookyear1922
