ADMICRO

Read the following passage and choose the best answer (A, B, C, D):
Cholera, a highly infectious disease, has resulted in millions of deaths time after time over centuries. It is caused by the bacterium Vibrio cholera, first isolated by Robert Koch in 1883. The organism enters the body through the digestive tract when contaminated food or water is ingested.The bacteria multiply in the digestive tract and establish infection. As they die, they release a potent toxin that leads to severe diarrhea and vomiting. This results in extreme dehydration, muscle cramps, kidney failure, collapse, and sometimes death. If the disease is treated promptly, death is less likely. In many countries, a common source of the organism is raw or poorly cooked seafood taken from contaminated waters. The disease is especially prevalent after a natural disaster or other destruction that results in a lack of fresh water. Sewer systems fail, and waste travels into rivers or streams; piped water is not available so people must take their drinking and cooking water from rivers or streams. Because people frequently develop communities along waterways, the disease can be spread easily from one community to the next community downstream, resulting in serious epidemics
10. The word "epidemics" at the end of the passage is closest in meaning to" 

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