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The number one resistance problem is Staphylococcus aureus, said Daniel F. Sahm of Focus Bio-Inova. Forty-nine percent of these bacteria are resistant to methicillin--the antibiotic usually prescribed to kill them--and resistance rates continue to rise. Most staph bacteria that resist methicillin also resist several other antibiotics, he said, and some resist all seven of the antimicrobials commonly used for staph. What is most surprising about resistant staph is that it is on the increase in both inpatient and outpatient settings, he said. Real-time monitoring of resistant strains and trends is essential, Sahm said, in order "to gain a better understanding about the environments in which they arise." For example, the second most common bacterial resistance problem is Streptococcus pneumoniae, where 16% of infections are now resistant to penicillin, but multidrug resistance has declined, he said. For Escherichia coli, however, the multidrug resistance rate in hospital settings is about 15% and rising |
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