Word: bacterias
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Thus far, health officials have found no common origin of the mysterious illness. However, incoming tests from patient cultures have now ruled out salmonella, shigella, campylobacter and yersinia strains of bacteria as a potential cause of the illness...
...looking at one particular area, it's the salad bar," he said. "Every other food item has come back clean of toxins and bacteria...
Rosenthal said cultures of stool from affected students and staff had come up negative for bacteria. Tests for blood and water have also been negative. Children's Hospital has also conducted preliminary tests for the roto virus at Harvard, but so far those tests have turned up negative, Rosenthal said...
...Dowling, a chemist with the Cambridge water department, said preliminary tests yesterday strongly suggest the epidemic was not caused by anything in Harvard's water supply. Water department officials were unable to find any evidence of coliform bacteria or other common types of contamination, he said...
Many believed their symptoms were due to yesterday's Chem 10 lab, which involved some groups working with live E. Coli bacteria. But Baird Professor of Science Dudley R. Herschbach said there was little chance that the bacteria caused the epidemic...