Toxoplasmosis Frequency Rate in Rheumatoid Arthritis Patients in Northeastern Iran.

Background: Toxoplasmosis is a zoonotic disease caused by the parasite a cosmopolitan intracellular parasite. It can be a risk factor for auto-immune diseases, including rheumatoid arthritis (RA). This study was designed to investigate the possible association between serological history of infection and defined clinical manifestation of RA in Northeast of Iran.