On 18 May the United States imposed a 21-day entry ban on nationals of the Democratic Republic of Congo, Uganda and South Sudan, including green-card holders 1. US citizens may still enter but face enhanced public-health screening at George Bush Intercontinental Airport in Houston from 26 May 2. South Sudan was included despite having no confirmed Bundibugyo cases, on the stated logic of porous borders with the DRC 3. The measure followed three days after WHO declared the Bundibugyo emergency .
The ban came first; four days later WHO's Emergency Committee issued Temporary Recommendations advising against travel and trade restrictions, and the ban has not been lifted since 4. Africa CDC publicly opposed the restrictions on 19 May 5. A major power has now banned travel against live WHO advice during an active emergency for the first time since the West Africa Ebola crisis of 2014, whose travel-ban failures the IHR exit-screening model was written to replace.
Entry bans push exposed travellers toward unscreened land routes and onward third-country flights, the exact behaviour exit screening at source is built to capture, and they discourage the honest disclosure border co-operation depends on. Bans also operate on nationality rather than exposure: a green-card holder WHO has not left the US in a year falls under the bar, while the screening of returning US citizens at Houston targets actual travel history. The 21-day entry ban therefore catches people by passport, not by where they have been.
Washington's reach for a border measure rather than a deployment has a structural backdrop. The USAID outbreak-response unit that would have surged personnel to Ituri had already been disbanded before the emergency , leaving entry restriction as one of the few levers still readily available. For readers planning travel, the practical effect is narrow: the bar falls on green-card holders and nationals of the three countries, while US citizens face questions and a temperature check at Houston, not exclusion.
