The trichinosis, it is caused by the called nematode Trichinella spiralis, it is trasnmitida for the meat consumption, in general of raw or not well cooked pig. The mature parasites live in the mucous one intestinal and the light of the same intestine, causing early diarrhea and abdominal pain (it is not mandatory to have the symptoms). The embryos that deposit the females penetrate the intestinal wall they invade the cells of the skeletal muscle of the intestine, the illness in if, it can be asintomática or in occasions to end up being mortal. The huevecillos is incubated in uterus being able to take place up to 1500 alive larvas. The larvas penetrate the mucous one intestinal and they pass to the sanguine torrent, like they have high tropismo(afinindad) for the muscles they finish lodging in muscular fibers, where they are wound and it embeds, this cyst is called cell nurse. This encapsulacion is complete of 4 to 5 weeks after the infection. The larvas can survive inside the cell nurse for a lot of time, but finally they are destroyed by the own guest's process granulomatoso, leaving a scar fibrótica.
Their prevalencia is because the domestic pig is an important component of the diet. The cases are usually sporadic or in bud, the infection in human is acquired when eating raw or not well cooked meat of animals infected pig in particular, but they have been in a wide range of mammals (even polar bears), also when mixing head meat inadvertently with infected pig meat, either in the machine of milled meat or in not well cooked stews. The embedded larvas die at the 55°C, and to cook the head meat at 77°C, the parasites can also die although slowly it is with freezing temperatures among -15°C for 20 days.
The pig is almost always infected when eating infected garbage, or rats, therefore he stayed the cycle pig to pig or pig-rat-pig. fortunately it is a cycle very narrow parasticio and it doesn't allow a great dissemination in ways infectantes.
The control measures are: to maintain in protected corrals from the rats to the pigs, not to feed them with garbage, to avoid the contamination of the head meat with that of pig, in some countries the triquinoscopia is used, but it is necessary more than a larva for gram of meat to detect it.
I wait to have solved your doubts, if you have some question you don't doubt to send it.
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