Other 85 (25) 28 (18) P = 0.007; OR 3.9; 95% CI 1.5, 9.9, respectively; Table 3 ). The majority (68%) of patients with an infectious exposure had one documented infection, but 28% had two and 4% had three to five infections documented within 6 months of illness onset. Patients >7.5 years of age were more likely than younger patients to have two infections (P = 0.038; OR 2.7; 95% CI 1.1, 6.3; Table 3 ). Respiratory infections were the most common type of infection reported, followed by mucocutaneous and gastrointestinal infections (Table 3) . Pharyngitis was the most frequent specific infection and was more prevalent in patients >7.5 years of age than in younger patients (P = 0.017; OR 2.7; 95% CI 1.2, 6.0; Table 3) . A flu or febrile illness and otitis media were each seen in 13% of patients, and an upper respiratory infection in 10% of patients within 6 months before illness onset. There were no other differences noted in the infection site or type of infection among clinical or autoantibody phenotypes, nor by gender, race, disease course or delay to diagnosis.