Download Tapeworms, Lice, and Prions: A compendium of unpleasant by David Grove PDF

By David Grove

A rare array of infectious brokers impacts people; from worms, arthopods, and fungi to micro organism, viruses, and prions. during this compendium of the curious and engaging organisms that reason disorder, together with Legionnaire's ailment, mumps, CJD, and chlamydia, David I. Grove presents a full of life, fact-filled account of the character of every organism, their existence cycle, the creative ways that they infect people, and the human tales at the back of their discovery.

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Both have four suckers but only T. solium has hooklets. 8). In 1684 he found some cysts in the abdominal cavity of a hare (a larger relative of a rabbit). When he examined them closely, he noticed a little nubbin inside each one like a retracted neck, and what is more, the whole cysts moved about independently as if they were animals. In the following year, Philip Hartmann (1648–1707), a doctor in what was then Königsberg, Prussia (now Kaliningrad, Russia), dissected a goat and found white, globular cysts in the abdominal cavity.

263 Thereupon Redi put a snake, some fish, some eels and a slice of veal from a milk-fed cow, each into separate, large, wide-mouthed flasks. Each flask was carefully sealed then a duplicate series was set up except that each flask was left open to the atmosphere. You can guess what happened. No maggots developed in the closed flasks whereas Redi saw flies go in and out of the open flasks and in them maggots appeared. So not only had Redi shown that maggots did not breed spontaneously in meat but he had traced the development of eggs through larval (the maggot) and pupal stages to adulthood.

So it was that cavemen knew and doubtless were terrified by the horrid, motile creatures that occasionally passed from the anus. We now know that there are thousands of species of worms but it is only in the last two or three centuries that they have all been discovered and sorted out. Worms are soft-bodied invertebrates, that is, animals without backbones. Structurally, there are two forms—roundworms and flatworms. Functionally, they also fall into one of two groups. The first category contains the free-living worms that live happily and freely in favourable niches in the environment, feeding on any detritus they find tasty, and passing on from one generation to the next.

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