- Rheumatological manifestations are frequently reported in patients with brucellosis.In a retrospective study of 90 patients diagnosed with brucellosis over a period of 18 years, 83 (92%) patients were Bedouins, 55 of whom (61%) reported ingestion of unpasteurized goat milk and goat milk products. The male/female ratio was 1:1, and the adult to child ratio was 3:2. The mean age of the patients was 25 years (range, 1–72 years). Rheumatological manifestations (myalgia, arthralgia, and arthritis) were reported in more than half of the patients. These manifestations started on days 3 and 4 of the disease and were mild to moderate in severity. Myalagia was evident in 49 (54%) patients and was more common in adults than in children (67% versus 37%; P < .01) and in men (67%) than in women (42%; P < .01). Arthralgia was the most common musculoskeletal manifestation, found in 55 (61%) patients, and occurred more often in children than in adults (74% versus 52%; P < .05). Arthritis was detected in 37 (41%) patients. The hip and knee joints were the most common sites of arthritis (31% each) followed by sacroiliac involvement (17%) and shoulder or spine involvement (5% each). Arthritis was also more common in children (63% versus 29%; P < .01). The prevalence of arthritis was similar in men and women. Cure was achieved in all patients after antibiotic therapy.