The Elements of Military Hygiene Especially Arranged for Officers And Men of Th
The Elements of Military Hygiene Especially Arranged for Officers And Men of Th
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Or the recovery may be apparent only, and the disease may recur when chill, exposure, or other illness lowers vi- tality. Malaria causes many deaths, especially in the tropics, in India about one million annually ; but if a single infection is not fatal very soon, the tendency is to recovery, as the parasites cannot maintain their powers indefinitely unless they renew their strength (in some unknown way) by sexual reproduction, and that can only occur in mosquitoes of certain kinds. Minute diff...erences can be detected among the para- sites of any kind of infection, and these are now known to mark sexual differentiation. If the right kind of mosquito bites the infected individual, these sexual differences become more marked in its stomach, and sexual conjugation there takes place. The impreg- nated female (this term is not accurate, but it conveys the idea) bores into the stomach-wall and undergoes a development which eventually results in the production of hundreds or thousands of young forms that finally find their way to the salivary glands and mouth of the mosquito, and enter, by way of the wound made by the insect, the next man it bites, and the cycle begins again in him.
What to read after The Elements of Military Hygiene Especially Arranged for Officers And Men of Th?
You can find similar books in the "Read Also" column, or choose other free books by P M Percy Moreau Ashburn to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Or the recovery may be apparent only, and the disease may recur when chill, exposure, or other illness lowers vi- tality. Malaria causes many deaths, especially in the tropics, in India about one million annually ; but if a single infection is not fatal very soon, the tendency is to recovery, as the parasites cannot maintain their powers indefinitely unless they renew their strength (in some unknown way) by sexual reproduction, and that can only occur in mosquitoes of certain kinds. Minute diff...erences can be detected among the para- sites of any kind of infection, and these are now known to mark sexual differentiation. If the right kind of mosquito bites the infected individual, these sexual differences become more marked in its stomach, and sexual conjugation there takes place. The impreg- nated female (this term is not accurate, but it conveys the idea) bores into the stomach-wall and undergoes a development which eventually results in the production of hundreds or thousands of young forms that finally find their way to the salivary glands and mouth of the mosquito, and enter, by way of the wound made by the insect, the next man it bites, and the cycle begins again in him.
What to read after The Elements of Military Hygiene Especially Arranged for Officers And Men of Th?
You can find similar books in the "Read Also" column, or choose other free books by P M Percy Moreau Ashburn to read onlineMoreLess
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