CDC reports first case of vancomycin resistant Staphylococcus aureus
New York Scott Gottlieb
The Centers for Disease Control and Prevention (CDC) has reported that in
summer 2002, a 40 year old Michigan woman became the first person worldwide
known to have been infected with a strain of Staphylococcus aureus that
was resistant to the antibacterial vancomycin.
The Michigan woman developed foot ulcers and other skin infections after
becoming infected with the bacterium following an amputation. She recovered
after doctors prescribed a different course of antibiotics. The CDC said the
case highlighted the growing problem of antibiotic resistance (New England
Journal of Medicine 2003;348:1342-7).
Until recently, vancomycin was the only uniformly effective treatment for
staphylococcal infections. In 1997, the first clinical isolate of S aureus
with reduced susceptibility to vancomycin was reported, and since June 2002,
eight confirmed infections with such strains have been reported in patients in
the United States. The minimal inhibitory concentrations of vancomycin (the
amount of the antibiotic needed to keep the bacteria from replicating) reported
for these isolates are in the intermediate range (8-16 micrograms/ml) according
to criteria defined by the National Committee for Clinical Laboratory Standards.
Staphylococcal isolates with reduced susceptibility to glycopeptides, such as
vancomycin and teicoplanin, are a serious public health problem because
staphylococci frequently show multidrug resistance, and glycopeptides are the
only remaining effective drugs. The CDC also confirmed that a second, unrelated
vancomycin resistant staphylococcal infection had been confirmed in Pennsylvania
several months after the Michigan case.
"Although the infection in the patient in this first case was treatable with
other antibiotics, these findings remind us of the need for infection control
and judicious use of antibiotics in the healthcare setting to prevent antibiotic
resistance," said Dr Julie Gerberding, director of the CDC.
Nearly all strains of S aureus in the United States are now resistant
to penicillin. Doctors embraced vancomycin in the late 1990s as resistant forms
of the bacterium spread from hospital settings into the community.
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