CHRIS BJORNBERG / SCIENCE PHOTO LIBRARY CHRIS BJORNBERG / SCIENCE PHOTO LIBRARY
Computer illustration of Staphylococcus aureus bacteria. This common bacteria is not always pathogenic, but the emergence of antibiotic resistant strains, or MRSAs (Multidrug-resistant Staphylococcus aureus) is a serious problem in hospitals and other institutions such as nursing homes, schools, and prisons.
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