Tuberculosis. Hermione knew of it, of course, even without her medical knowledge she'd known of the respiratory disease from her own past studies and time spent in France with muggles. The vaccine wouldn't be produced for a few years yet, if she remembered correctly, but there were other options. Less preferable options, yes, but options nonetheless. Silas released her hand and went still, seemingly in shock. She tensed, and looked him over before biting her lip and looking to William for support.