Tanzania, Aug. 10 -- The United States has tightened travel restrictions for people returning from Uganda, South Sudan and the Democratic Republic of Congo (DRC) as it steps up measures to prevent the spread of Ebola.

Under the new measures, travellers arriving from Uganda and South Sudan will undergo enhanced health screening, while people travelling from the DRC will face tougher restrictions. Those who have recently been in the DRC must spend 21 days outside the country before they can enter the US on a commercial flight.

The measures come as health authorities respond to a serious Ebola outbreak in eastern DRC, where cases have been reported across several provinces, raising concerns about cross-border transmission.

The US decision...