Border patrol agents at Washington's Dulles International and New York's JFK airports in particular have been told to ask travellers about possible exposure to the virus and to be on the lookout for anyone with a fever, headache, achiness, sore throat, diarrhea, vomiting, stomach pain, rash or red eyes.
Andrews Air Force Base in suburban Maryland, which will receive several African heads of state, is screening passengers too, while US Secret Service agents in charge of security for the three-day summit have been briefed on what to look for and how to respond, officials said yesterday.
"There is always the possibility that someone with an infectious disease can enter the United States," CDC spokeswoman Barbara Reynolds said yesterday. "The public health concern is whether it would spread, and, if so, how quickly.'"
The Ebola virus causes a hemorrhagic fever that has sickened more than 1,300 people in Africa, killing more than 700 mostly in Liberia, Guinea and Sierra Leone. It is spread through direct contact with bodily fluids, such as blood or urine, unlike an airborne virus like influenza or the common cold. A person exposed to the virus can take up to 21 days to exhibit any symptoms, making it possible for infected travellers to enter the US without knowing they have it.
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Health officials say the threat to Americans remains relatively small, even with the uptick in travel this week between Africa and the United States. In the past decade, five people have entered the US known to have a viral hemorrhagic fever, including a case last March of a Minnesota man diagnosed with Lassa Fever after travelling to West Africa.
A vaccine against Ebola has been successfully tested with monkeys, and there is hope it could become available as early as next July, Dr Anthony Fauci of the National Institutes of Health told "CBS This Morning" television yesterday.