UNIVERSITY OF CALIFORNIA – SAN DIEGO IMAGE: <EM>STAPHYLOCOCCUS AUREUS</EM> BACTERIA ARE GENERALLY HARMLESS, BUT CAN SOMETIMES BECOME AN OPPORTUNISTIC PATHOGEN. PAST EFFORTS TO DEVELOP A VACCINE HAVE PROVED FRUITLESS. CREDIT: NIAID For the most part, the bacterium Staphylococcus aureus is common and harmless, posing no threat to humans with whom they coexist. Occasionally, though, it can become...
