Sample Essay

E.coli infection is mainly an oral-fecal transmission pathway. Hence poorly chlorinated water, unpasteurized milk are common fluid sources. Uncooked or improperly cooked beef another forms of meat are another likely source of transmission. Vegetables directly from farms or stores, which are not properly washed, like lettuce, spinach alfalfa etc are another source of infection. (Escherichia coli O157:H7, 2005). Exposure to farm animals, or contact with infected people are also risk factors. In the United States infected children in daycare centers also a major source of spread. So questions pertaining to contact and handling of the above stated risk factors should be asked.

Source of the outbreak according to the currently present evidence is alfalfa sprouts. Contaminated alfalfa seeds initially caused the outbreak and then the infection easily spread through person to person transfer. The leading hypothesis is that contaminated alfalfa sprouts or seeds of alfalfa sprouts were the initial cause of the outbreak. People who consumed these foods in the area of Michigan got infected with E.coli O157:H7 and then the infection were further transferred to other people with whom they came into contact.

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