Most infections were in rheumatoid arthritis patients, and 44% were extrapulmonary or disseminated.

We present the results of a nationwide survey of infectious disease consultants to identify mycobacterial and other serious infections in patients receiving anti-tumor necrosis factor compounds and other novel targeted therapies. Nontuberculous mycobacterial infections, histoplasmosis, and invasive Staphylococcus aureus infection were all reported more frequently than was tuberculosis disease in this context.

Patients with psoriasis are more likely to be colonized with S. aureus than patients with RA. Patients who are colonized with S. aureus are more likely to remain colonized if exposed to TNF-α inhibitors.

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