( CNN ) -- The worst-ever outbreak of Ebola virus is stretching the medical capacities of Guinea , Liberia and Sierra Leone -- the three West African countries hit worst by the virus -- and alarming leaders around the world . The following countries have restrictions in place aimed at keeping Ebola out , according to International SOS . AFRICA . Cameroon . Cape Verde . Chad . Equatorial Guinea . Gabon . Gambia . Kenya . Mauritania . Mauritius . Namibia . Rwanda . Senegal . Seychelles . South Africa . South Sudan . AMERICAS . Antigua and Barbuda . Belize . Canada . Colombia . Dominican Republic . Guyana . Haiti . Jamaica . Panama . Saint Kitts and Nevis . Saint Lucia . Saint Maarten . Saint Vincent and the Grenadines . Suriname . Trinidad and Tobago . United States . ASIA . North Korea . OCEANIA . Australia . Source : International SOS , November 3 .
The disease has killed thousands since deadliest ever outbreak began . Guinea , Liberia and Sierra Leone are the worst - hit countries . Countries around the world have imposed travel restrictions related to outbreak .