DANIELA BECKMANN / SCIENCE PHOTO LIBRARY DANIELA BECKMANN / SCIENCE PHOTO LIBRARY
Colonies of Staphylococcus aureus bacteria growing on blood agar in a petri dish. S. aureus is a Gram-positive bacteria that is found on the skin and mucous membranes of humans and many animals. The bacteria are usually harmless, but infections can occur on broken skin or within a blocked sweat or sebaceous gland, resulting in boils, pustules and abscesses. S. aureus can also cause food poisoning, producing toxins that induce vomiting. Some strains have become resistant to many commonly prescribed antibiotics.
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