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Stool samples were taken from 156 Maryland nursing home residents for experimental purposes. These samples were analyzed because the origin of 20 outbreaks of gastroenteritis between the months of November 1987 and February 1988. More than half (52%) of all the samples taken tested positive for Norwalk-like viruses (NLVs), which are microorganisms that come from the family Caliciviridae. These microorganisms are called Norwalk-like because they are similar to the Norwalk virus that was first documented in Norwalk, Ohio. The samples were frequently tested for any bacteria that might be present, because the researchers did not usually find any bacteria, they assumed the gastroenteritis infections were viral. A technique called reverse transcriptase-polymerase chain reaction (RT-PCR) was used in order for the researchers to re-examine the specimens for the presence of different enteric viruses. ... The predominant strain was found to be in the G2 category and is called MD-145-12 (it is similar to Bristol, a virus that has been going around the United States and overseas) this was found in 14 of the 20 outbreaks.
Approximate Word count = 708
Approximate Pages = 2.8
(250 words per page double spaced)
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