Kelly A Jackson1, Runa H Gokhale1, Joelle Nadle2, Susan M Ray3, Ghinwa Dumyati4, William Schaffner5, David C Ham1, Shelley S Magill1, Ruth Lynfield6, Isaac See1. 1. Division of Healthcare Quality Promotion, Centers for Disease Control and Prevention, Atlanta, Georgia. 2. California Emerging Infections Program, Oakland. 3. Georgia Emerging Infections Program and the Atlanta Veterans Affairs Medical Center, Decatur. 4. University of Rochester Medical Center, New York. 5. Vanderbilt University School of Medicine, Nashville, Tennessee. 6. Minnesota Emerging Infections Program, Saint Paul.
Abstract
BACKGROUND: Public health and infection control prevention and surveillance efforts in the United States have primarily focused on methicillin-resistant Staphylococcus aureus (MRSA). We describe the public health importance of methicillin-susceptible S. aureus (MSSA) in selected communities. METHODS: We analyzed Emerging Infections Program surveillance data for invasive S. aureus (SA) infections (isolated from a normally sterile body site) in 8 counties in 5 states during 2016. Cases were considered healthcare-associated if culture was obtained >3 days after hospital admission; if associated with dialysis, hospitalization, surgery, or long-term care facility (LTCF) residence within 1 year prior; or if a central venous catheter was present ≤2 days prior. Incidence per 100 000 census population was calculated, and a multivariate logistic regression model with random intercepts was used to compare MSSA risk factors with those of MRSA. RESULTS: Invasive MSSA incidence (31.3/100 000) was 1.8 times higher than MRSA (17.5/100 000). Persons with MSSA were more likely than those with MRSA to have no underlying medical conditions (adjusted odds ratio [aOR], 2.06; 95% confidence interval [CI], 1.26-3.39) and less likely to have prior hospitalization (aOR, 0.70; 95% CI, 0.60-0.82) or LTCF residence (aOR, 0.37; 95% CI, 0.29-0.47). MSSA accounted for 59.7% of healthcare-associated cases and 60.1% of deaths. CONCLUSIONS: Although MRSA tended to be more closely associated with healthcare exposures, invasive MSSA is a substantial public health problem in the areas studied. Public health and infection control prevention efforts should consider MSSA prevention in addition to MRSA. Published by Oxford University Press for the Infectious Diseases Society of America 2019.
BACKGROUND: Public health and infection control prevention and surveillance efforts in the United States have primarily focused on methicillin-resistant Staphylococcus aureus (MRSA). We describe the public health importance of methicillin-susceptible S. aureus (MSSA) in selected communities. METHODS: We analyzed Emerging Infections Program surveillance data for invasive S. aureus (SA) infections (isolated from a normally sterile body site) in 8 counties in 5 states during 2016. Cases were considered healthcare-associated if culture was obtained >3 days after hospital admission; if associated with dialysis, hospitalization, surgery, or long-term care facility (LTCF) residence within 1 year prior; or if a central venous catheter was present ≤2 days prior. Incidence per 100 000 census population was calculated, and a multivariate logistic regression model with random intercepts was used to compare MSSA risk factors with those of MRSA. RESULTS: Invasive MSSA incidence (31.3/100 000) was 1.8 times higher than MRSA (17.5/100 000). Persons with MSSA were more likely than those with MRSA to have no underlying medical conditions (adjusted odds ratio [aOR], 2.06; 95% confidence interval [CI], 1.26-3.39) and less likely to have prior hospitalization (aOR, 0.70; 95% CI, 0.60-0.82) or LTCF residence (aOR, 0.37; 95% CI, 0.29-0.47). MSSA accounted for 59.7% of healthcare-associated cases and 60.1% of deaths. CONCLUSIONS: Although MRSA tended to be more closely associated with healthcare exposures, invasive MSSA is a substantial public health problem in the areas studied. Public health and infection control prevention efforts should consider MSSA prevention in addition to MRSA. Published by Oxford University Press for the Infectious Diseases Society of America 2019.
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