Related Experiment Video
Updated: May 23, 2026

Subcutaneous Infection of Methicillin Resistant Staphylococcus Aureus (MRSA)
Published on: February 10, 2011
A clone of methicillin-resistant Staphylococcus aureus among professional football players
Sophia V Kazakova1, Jeffrey C Hageman, Matthew Matava
1Division of Healthcare Quality Promotion, National Center for Infectious Diseases, Atlanta, GA 30333, USA. srk7@cdc.gov
Background:
Methicillin-resistant Staphylococcus aureus (MRSA) is an emerging cause of infections outside of health care settings. We investigated an outbreak of abscesses due to MRSA among members of a professional football team and examined the transmission and microbiologic characteristics of the outbreak strain.
Methods:
We conducted a retrospective cohort study and nasal-swab survey of 84 St. Louis Rams football players and staff members. S. aureus recovered from wound, nasal, and environmental cultures was analyzed by means of pulsed-field gel electrophoresis (PFGE) and typing for resistance and toxin genes. MRSA from the team was compared with other community isolates and hospital isolates.
Results:
During the 2003 football season, eight MRSA infections occurred among 5 of the 58 Rams players (9 percent); all of the infections developed at turf-abrasion sites. MRSA infection was significantly associated with the lineman or linebacker position and a higher body-mass index. No MRSA was found in nasal or environmental samples; however, methicillin-susceptible S. aureus was recovered from whirlpools and taping gel and from 35 of the 84 nasal swabs from players and staff members (42 percent). MRSA from a competing football team and from other community clusters and sporadic cases had PFGE patterns that were indistinguishable from those of the Rams' MRSA; all carried the gene for Panton-Valentine leukocidin and the gene complex for staphylococcal-cassette-chromosome mec type IVa resistance (clone USA300-0114).
Conclusions:
We describe a highly conserved, community-associated MRSA clone that caused abscesses among professional football players and that was indistinguishable from isolates from various other regions of the United States.
Insights
A highly conserved community-associated MRSA clone caused abscesses in professional football players. This strain, USA300-0114, was indistinguishable from MRSA found in other US regions.
Area of Science:
- Infectious Diseases
- Microbiology
- Epidemiology
Background:
- Methicillin-resistant Staphylococcus aureus (MRSA) is increasingly causing infections outside healthcare settings.
- An outbreak of MRSA-related abscesses occurred among professional football players.
- The study investigated transmission and microbial characteristics of the outbreak strain.
Purpose of the Study:
- To investigate an outbreak of MRSA abscesses in a professional football team.
- To examine the transmission dynamics and microbiological features of the MRSA strain involved.
- To compare the outbreak strain with other community and hospital-acquired MRSA isolates.
Main Methods:
- A retrospective cohort study and nasal-swab survey of 84 football players and staff.
- Pulsed-field gel electrophoresis (PFGE) and genetic typing of recovered S. aureus isolates.
- Comparison of MRSA isolates from the team with other community and hospital isolates.
Main Results:
- Eight MRSA infections occurred in 5 players during the 2003 season, primarily at turf-abrasion sites.
- MRSA infection was linked to lineman/linebacker positions and higher body-mass index.
- The outbreak MRSA strain (USA300-0114) was genetically identical to strains from other US community clusters and carried Panton-Valentine leukocidin genes.
Conclusions:
- A highly conserved, community-associated MRSA clone (USA300-0114) caused abscesses in professional football players.
- This clone was indistinguishable from MRSA isolates found in diverse geographic locations across the United States.
- The findings highlight the potential for MRSA transmission in close-contact athletic environments.
Related Concept Videos
Mismatch Repair
Defense Against Bacterial Pathogens
Phagocytes
Phagocytes are the frontline soldiers of the immune system. They include neutrophils and macrophages. Neutrophils are the most abundant type of white blood cell and are quickly mobilized to the site of infection. Macrophages are larger cells that patrol...
Development of Antibiotic Resistance
Staphylococcal Skin Infections
Mechanism of Antibiotic Resistance in MRSA
Clinical Significance of Antibiotic Resistance

