Dr Caroline Blackwell, one of the study team from the university's department of medical microbiology, said the discovery also had implications for research into cot death and chest infections among babies.

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D. in medical microbiology at the University of Colorado.

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During 22 years she has been responsible for the Department of microbiology, clinical biology and pneumophtisiology at the Medical School in Algiers.

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Eleven years ago Ronald Stevens, a professor of microbiology and immunology at the UCLA School of Medicine, got fed up trying to test his medical students' diagnostic skills with paper and pencil.

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