The perpetrators of amoeba
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Answer:
If the amoeba isn’t already in dining mode at this point, the intense burst of human body heat can help it shape-shift out of dormancy. Like anyone else waking up somewhere unfamiliar, the brain-eating amoeba is desperate for a food source, so it slithers its way up the olfactory nerve until it spies a tasty-looking tangle of neurons and digs in. The host’s immune system, sensing an unwelcome visitor, sends an onslaught of white blood cells to take down the feasting parasite. That commotion leads to a swollen—and, eventually, irreparably damaged—brain.
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Explanation:
The organism responsible, Naegleria fowleri, dwells in warm freshwater lakes and rivers and usually targets children and young adults. Once in the brain it causes a swelling called primary meningoencephalitis. The infection is almost universally fatal: it kills more than 97 percent of its victims within days.
Although deadly, infections are exceedingly uncommon—there were only 34 reported in the U.S. during the past 10 years—but evidence suggests they may be increasing. Prior to 2010 more than half of cases came from Florida, Texas and other southern states. Since then, however, infections have popped up as far north as Minnesota.