How long would you treat with antimycobacterials before starting biologic DMARD in a patient with latent TB and active rheumatoid arthritis?  

This is a common question rheumatologists ask their ID colleagues. Given the diversity of patient presentations, though, there isn't a blanket answer. One reason there's no blanket answer is because it is so hard to study LTBI risks, due to infrequent conversion to active TB, which is a fortunate th...