A 21-Day Window Now Decides Who Boards US Flights

The number that matters in this outbreak is not a case count. It is 21 — the incubation window for Ebola, and now the figure that determines whether an airline will let you onto an aircraft. Travellers who have been in the Democratic Republic of the Congo within 21 days of departure are barred from boarding commercial flights bound for the United States, a restriction that applies to US citizens and nationals as well as foreign visitors. It is an unusually blunt instrument, and it works at the check-in desk rather than the border.

The outbreak driving it is caused by Bundibugyo virus, a less-familiar member of the Ebola family. By mid-June the DRC had reported 837 confirmed cases and 196 confirmed deaths. Uganda, where the virus crossed the border, recorded 19 confirmed cases and two confirmed deaths, plus one probable case and one probable death. Those totals are small next to the West African epidemic of a decade ago, but the geography is difficult: the affected districts sit near busy road, river and air corridors, which is precisely why governments reached for movement controls this early.

Canada has gone further in a different direction. Until 28 September 2026 it has temporarily suspended immigration documents for residents of countries it classes as high or very high risk — currently the DRC, Uganda and South Sudan — and has instructed commercial and private carriers to deny boarding to affected foreign nationals travelling to Canada. Uganda, for its part, suspended all direct flights to and from the DRC and halted bus and boat border crossings for a four-week period, and travellers leaving Uganda may face exit screening including health declarations and temperature checks.

For anyone with plans in the region, the practical lesson is that the restriction attaches to your recent itinerary, not your passport. A safari in Uganda followed by a connection home through a European hub can still trip the rule, and airlines are the ones enforcing it. Check the current US and Canadian notices before ticketing, keep documentation of where you have actually been, and build slack into any trip that touches Central or East Africa this autumn. Rules keyed to a rolling 21-day window can change faster than a booking can be rearranged.

Sources: CBS News, Fragomen