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<p>Capable of causing invasive infections, <em>Streptococcus pyogenes</em> (Group A strep) has been susceptible to beta-lactam antibiotics for more than a half century. Ominously, researchers investigating an upsurge of Group A strep cases in Seattle found a mutated strain that confers resistance to ampicillin and other beta-lactam drugs.</p>

Mutant Strep Shows Resistance to Beta-Lactams

A threat to the mainstay strep drugs