Officials with the Philadelphia Health Department confirmed Friday they are monitoring approximately 30 people in the city for the Ebola virus, although none are showing symptoms, since they recently traveled from affected areas.
Medical officials will check on the individuals, who have not been quarantined, over a 21-day period.
It is unclear when those being monitored arrived in Philly or how they traveled to the city.
Philadelphia International Airport does not receive direct flights from West African countries and now the Philly airport -- and others in the Keystone State -- are no longer accepting airline passengers from parts of the world affected by Ebola, according to the Pennsylvania Department of Health. That means a traveler, who visited Liberia a month ago, will be prohibited from taking a Philly-bound flight from London or another part of the world.
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Authorities with the Centers for Disease Control Prevention asked local health departments to follow-up on any travelers who entered the U.S. at one of the country's designated entry sites -- O'Hare International Airport in Chicago, New York's John F. Kennedy International Airport, Hartsfield-Jackson Atlanta International Airport, Newark Liberty International Airport in north Jersey and Washington Dulles International Airport -- and then moved to another destination.
Philadelphia health officials urge calm, and remind the public that the monitoring is a precautionary measure and there has yet to be a confirmed case of Ebola in the Delaware Valley.