Travelers from three West African countries must now go to only one of five airport hubs if they want to enter the U.S.

Bloomberg reported that the countries affected the most by the Ebola virus outbreak, including Liberia, Guinea and Sierra Leone, are on the list for only five airports to accept travelers.

The five airports with the highest traffic from those areas were already previously selected to conduct screenings of incoming travelers.

The list includes Atlanta,Chicago, Newark, New York JFK and Washington airports.

The new practice went into effect Wednesday, according to the Department of Homeland Security.

"We currently have in place measures to identify and screen anyone at all land, sea and air ports of entry into the United States who we have reason to believe has been present in Liberia, Sierra Leone or Guinea in the preceding 21 days," Secretary Jeh Johnson said, according to Bloomberg.

The move comes two weeks after a patient from Liberia, Thomas Duncan, died in Dallas, and two nurses near him were infected.

In an effort to curb criticism of the health officials' handling of the virus spread on U.S. soil, these measures have been put in place.

Some politicians are moving for the flights to be canceled altogether from affected regions, but health experts say that will only worsen the spread in those countries and not benefit the U.S. in any way.

The airports which are going to handle the incoming travelers already see more than 90 percent of those coming from the affected countries.

Of the 36,000 who have left those countries in the past several months, 25 percent came into the U.S. via those five airports, the New York Times previously reported. JFK saw the highest percentage of those travelers, about 43 percent, while Washington received 22 percent.

As of Wednesday, the World Health Organization has reported more than 4,800 deaths in Guinea, Liberia and Sierra Leone. Previously Senegal and Nigeria had also seen several deaths, but since then the outbreak has ceased.