WEDNESDAY, May 11 (HealthDay News) — MRSA , a bacteria resistant to common antibiotics, has been discovered in supermarket meats, and the germ is apparently being introduced by human food handlers, a new study reports.
Although thorough cooking will kill the bacteria, consumers run the risk of infection if they handle meats contaminated with the germ, researchers said.
MRSA (methicillin-resistant Staphylococcus aureus ) is common in hospitals and nursing homes, where it can cause serious illness and even death. And so-called “community-acquired MRSA” has become a problem among some high school and college athletes who share equipment; this type of MRSA appears as a skin infection and is usually less serious, according to the U.S. Centers for Disease Control and Prevention.
It’s the community-acquired MRSA that was found in the meats, the researchers said.
“MRSA has always been found in human patients, but we found this in retail meat, so retail meat can be a reservoir of these bugs,” said study lead researcher Yifan Zhang, an assistant professor in the department of nutrition and food science at Wayne State University in Detroit.
“When people handle food, they can get the bugs from the meat if the meat is already contaminated,” she explained.
The risk of becoming infected is especially high if you have open cuts or sores on your hands or skin, Zhang added.
“When you handle food, especially if you have wounds on your hands, wear gloves to protect yourself from getting MRSA infection,” she said.
The researchers found a human strain of MRSA in meats, so people can also transfer the bacteria to meat, she added.
Contamination can occur if carriers of MRSA handle meat or if there is MRSA in the environment, which might happen in processing plants where the meat is processed, Zhang added.
The report was published in the May 11 online edition of the U.S. Centers for Disease Control and Prevention’s journal Emerging Infectious Diseases .
For the study, Zhang’s team purchased 289 raw meat samples, including 156 beef, 76 chicken and 57 turkey samples, from 30 grocery stores in Detroit from August 2009 through January 2010.
The researchers found that 22.5% of the samples were contaminated with S. aureus and six samples tested positive for MRSA. Of the six samples contaminated with MRSA, two were beef, three were chicken and one was turkey, the researchers said.
The extent of MRSA contamination in meat varies by the type of meat and where the meat was