a bundibugyo virus outbreak, part of the ebola family, reached 515 confirmed cases and 91 deaths in the democratic republic of congo, with 19 cases and 2 deaths reported across the border in uganda. there is no approved vaccine or treatment, and moderna with cepi committed $50m to accelerate candidates. cross-border filovirus transmission at this scale with no countermeasure is the kind of event that usually forces a continental response.