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A strain of bacteria found in milk and beef may be a trigger for developing rheumatoid arthritis in people who are at risk, according to a new study from the University of Central Florida. A team of UCF College of Medicine researchers has discovered a link between rheumatoid arthritis and Mycobacterium avium subspecies paratuberculosis, known as MAP, a bacteria found in about half the cows in the United States. The bacteria can be spread to humans through the consumption of infected milk, beef and produce fertilized by cow manure.

For the study, researchers recruited 100 of her patients who volunteered clinical samples for testing. Seventy-eight percent of the patients with rheumatoid arthritis were found to have a mutation in the PTPN2/22 gene, the same genetic mutation found in Crohn's patients, and 40 percent of that number tested positive for MAP. People born with this genetic mutation and who are later exposed to MAP through consuming contaminated milk or meat from infected cattle are at a higher risk of developing rheumatoid arthritis.

Rheumatoid arthritis is an autoimmune and inflammatory disease that causes the immune system to attack a person's joints, muscles, bones and organs. Patients suffer from pain and deformities mostly in the hands and feet. It can occur at any age but the most common onset is between 40 and 60 years old and is three times more prevalent in women. Some RA patients suffer from Crohn's disease and vice versa, the researchers say a national study needs to investigate the incidence of the two diseases in the same patients.
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