CDC expands Ebola screening to five major U.S. airports

Enhanced Ebola screening at John F. Kennedy International Airport was designed as a public-health filter, not a guarantee. The checks looked for travelers who might have been exposed during Ebola’s 21-day incubation period or who showed symptoms on arrival, then routed them into follow-up with state and local health officials. They could also collect contact information and offer education, but they could not detect someone carrying the virus without symptoms, and fever alone could trigger false alarms because many illnesses cause it.

JFK began the expanded screening on October 11, 2014, after the first imported Ebola case was identified in the United States. Within days, the Centers for Disease Control and Prevention extended the program to four other major airports, including Washington-Dulles International Airport, Hartsfield-Jackson Atlanta International Airport and George Bush Intercontinental Airport in Houston. CDC said the five airports together handled about 94% of travelers arriving in the United States who had been in Liberia, Sierra Leone and Guinea within the previous 21 days.

The reason JFK mattered so much was volume. In the 12 months ending July 2014, the airport received nearly half of travelers from the three West African nations. That made New York one of the most important entry points for federal monitoring, even as the actual danger to the public depended on whether an arriving traveler was already sick enough to spread the virus.

The first month of screening showed how limited, and how targeted, the program was. CDC reported that 1,993 travelers were screened from October 11 through November 10, 2014. Of those, 86, or 4.3%, were referred to CDC public-health officers for additional evaluation, and seven were symptomatic enough to be sent for medical assessment. The numbers suggested that most travelers passed through without incident, while a small group needed extra review.

The airport checks sat inside a wider containment effort. Exit screening in Guinea, Liberia and Sierra Leone had begun in August 2014, and CDC said an estimated 80,000 travelers had departed by air from those countries after those procedures were put in place. No international air traveler from those countries had been reported symptomatic with Ebola during travel after the exit screening began. On October 21, the Department of Homeland Security required travelers flying into the United States from Ebola-affected countries to arrive at one of the five participating airports.

CDC said the outbreak in West Africa had caused about 11,300 deaths. That toll explained why airport screening drew so much attention, but it also underscored the larger lesson: visible precautions at arrival gates could help public health officials find and monitor risk, yet the real protection still depended on early detection, isolation and follow-up once a traveler reached the United States.