Sticking on the critical appraisal theme, we have a look at tecovirimat, the antiviral suggested as an option for the treatment of monkeypox. How does it work, what does it do, how do we know, and how confident are we in the evidence base? As part of this, we have a think about the directness of evidence, and how far it might be sensible to extrapolate from the data we have to different clinical scenarios.