This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1910 edition. Excerpt: ... CHAPTER VI PREVENTION 33. List of the Possible Preventive Measures. -- One advantage of the malaria formula given in section 28, equation 4, is that it enables us not only to name the various preventive measures, but also to obtain some quantitative estimate of their relative utility. Suppose that an ...
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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1910 edition. Excerpt: ... CHAPTER VI PREVENTION 33. List of the Possible Preventive Measures. -- One advantage of the malaria formula given in section 28, equation 4, is that it enables us not only to name the various preventive measures, but also to obtain some quantitative estimate of their relative utility. Suppose that an anti-malaria campaign is contemplated in any locality, and let m be the proportion of infected persons at the beginning of the campaign, and mx be the proportion at the end of a given period. Then by the formula Wj = m + b*sai( 1 -- m)m -- rm. Hence m will be less than mv that is, the malaria will be reduced, if we can make suitable modifications in the factors b, s, a, i, r. Such modifications can be made in various ways, as follows: -- The biting factor, b, represents the average proportion of Anophelines which succeed in biting individuals. We have roughly estimated it at 1/4. Obviously, if we diminish this fraction we shall diminish the malaria in the locality. This can be done in many ways. The use of ordinary mosquito-nets, of wire-gauze to the windows and doors of houses, of punkas and fans (which drive away the insects), of culicifuges, that is, substances which, when applied to the skin, tend to keep them off, and even the use of smoke, woollen clothing and bed coverings, must all tend to have the desired effect. But, of course, if we hope to reduce the malaria throughout a considerable population, such measures must be adopted by a sufficiently large number of people. No appreciable effect will be produced on the general malaria rate if only a few persons take the trouble to use them, because b expresses the average proportion of insects which succeed in biting. The next factor in the equation is s, which denotes the proportion of..
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PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.
