The United States has issued fresh guidance to travellers affected by new Ebola-related entry restrictions, including passengers who have been stopped from boarding flights to the country.

The US Embassy in Kenya advised affected travellers to contact the Department of Homeland Security for assistance if they are denied boarding because of the new measures.

The restrictions affect certain travellers who have recently been in the Democratic Republic of Congo (DRC), Uganda or South Sudan.

Under the current rules, people who have been in the DRC within the previous 21 days may be prevented from boarding commercial flights to the United States until the 21-day period has passed.

Travellers who have recently been in Uganda or South Sudan and are permitted to enter the US may be redirected to designated airports for additional public health screening.

The designated airports include Washington-Dulles, Atlanta, Houston and New York’s John F. Kennedy International Airport.

The US authorities have urged affected passengers to keep important travel information available, including their passport details, flight information, current location and records showing when they left the affected countries.

Travellers who are denied boarding have been instructed to contact the dedicated US government team for assistance and provide details about their planned journey.

The measures come amid an ongoing Ebola outbreak in the region, prompting several countries to introduce additional screening and travel controls.

The US government has advised travellers to check the latest entry requirements with their airlines before travelling, particularly those who have recently visited the affected countries.

The new restrictions are aimed at reducing the possibility of Ebola being brought into the United States while allowing health authorities to monitor travellers who may have been exposed.