Relative proportion of MRSA increasing in S. aureus isolates

Relative proportion of MRSA increasing in <i>S. aureus</i> isolates
The relative proportion of methicillin-resistant Staphylococcus aureus is increasing in S. aureus isolates, and methicillin-sensitive S. aureus is becoming increasingly resistant to antibiotics, according to a study published in the April issue of JAMA Dermatology.

(HealthDay)—The relative proportion of methicillin-resistant Staphylococcus aureus (MRSA) is increasing in S. aureus isolates, and methicillin-sensitive S. aureus (MSSA) is becoming increasingly resistant to antibiotics, according to a study published in the April issue of JAMA Dermatology.

Marilyn Zabielinski, M.D., from the University of Miami Miller School of Medicine, and colleagues conducted a using from skin culture isolates from a hospital outpatient dermatology clinic. Three hundred eighty-seven S. aureus isolates were analyzed from Jan. 1, 2005, through June 30, 2011, to determine whether the relative proportions of and MSSA were changing or stable.

The researchers found that the overall relative proportions of MRSA and MSSA were 35.7 and 64.3 percent, respectively. The relative proportions were 33.3 and 66.7 percent, respectively, during the final six months of the study. Compared with the period from Jan. 1, 2005, through Dec. 31, 2007, the relative proportion of MRSA was significantly higher for the period from Jan. 1, 2008, through Dec. 31, 2010 (45.3 versus 28.3 percent). The sensitivity of MRSA to ciprofloxacin increased during the study period, while MSSA became increasingly resistant to ciprofloxacin, clindamycin, sulfate, and trimethoprim-sulfamethoxazole.

"Consistent with national data, the relative proportion of MRSA in this outpatient dermatology clinic in Miami has risen," the authors write. "In addition to the rise in proportion of MRSA in our outpatient dermatology clinic, we observed a notable trend that MSSA is becoming more resistant to many antibiotics."

More information: Abstract
Full Text (subscription or payment may be required)

add to favorites email to friend print save as pdf

Related Stories

Staph sepsis increases mortality in preterm infants

Mar 12, 2012

(HealthDay) -- Only about 1 percent of very low birth weight (VLBW) infants develop methicillin-resistant Staphylococcus aureus (MRSA) infections, and the morbidity and mortality are similar to that seen i ...

MRSA skin infections up, linked to furunculosis

Jul 27, 2012

(HealthDay) -- The incidence of community-associated methicillin-resistant Staphylococcus aureus (CA-MRSA) in the United States is increasing and is associated with follicular infection, most commonly follic ...

Recommended for you

Ebola in mind, US colleges screen some students

3 hours ago

University students from West Africa may be subject to extra health checks when they arrive to study in the United States as administrators try to insulate their campuses from the worst Ebola outbreak in ...

WHO: More Ebola cases in past week than any other

4 hours ago

The past week has seen the highest increase of Ebola cases since the outbreak in West Africa began, the World Health Organization said Friday, offering more evidence that the crisis is worsening.

Guidelines presented for diagnosing focal liver lesions

19 hours ago

(HealthDay)—Focal liver lesions (FLLs) are mostly benign, and can be diagnosed based on knowledge of their presentation, associated clinical and laboratory features, and natural history, according to clinical ...

User comments