CDC testing requirements for UK travelers The US Centers for Disease Control and Prevention has announced new testing requirements for travelers arriving from the UK, but research by the agency's own scientists shows the rule may have only a small impact on the spread of the new UK strain of coronavirus.
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Starting Monday in the UK, passengers must have a negative Covid-19 test within three days of boarding a flight to the United States. CDC testing requirements for UK travelers
A CDC press release Thursday hailed the new changes.
"Today, President Trump is taking another step to protect the health of the American people," according to the statement.
But according to researchers on the CDC's Covid-19 response team, testing three days before a flight might not accomplish very much -- reducing the risk of spreading the virus by just 5 to 9%.
Dr. Paul Offit, an infectious disease specialist at the University of Pennsylvania, said the new testing requirement "is like putting up a chain link fence to keep out a mosquito." CDC testing requirements for UK travelers
The CDC's order acknowledges that "testing does not eliminate all risk," but when combined with other measures like self-monitoring for symptoms, masks and distancing, "it can make travel safer."
A federal official told CNN that the new order is just one layer in a multi-layered approach to curtail the spread of the new variant, which appears to transmit more easily than other coronavirus strains.
In March, the CDC cut off travel from the UK for foreign nationals, which brought travel from the UK to the US down 90%, from about 30,000 to 3,000 passengers a day, the official said.CDC testing requirements for UK travelers
In addition, the CDC has recommendations for international travelers, including getting tested one to three days before a flight and three to five days after travel, combined with staying home for seven days after travel, even if they test negative.
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Covid-19 tests often miss recent infections, so someone can test negative and actually be infected because they're not shedding enough virus to be detected. CDC testing requirements for UK travelers
"Testing 72 hours before a flight is going to miss a lot of people," said Dr. Peter Hotez, an infectious disease specialist at the Baylor College of Medicine, who pointed out that the new variant appeared in the UK three months ago and is likely already in the United States.On the other hand, testing on the day of departure may be more effective, reducing the risk of transmission by 37 to 61%, according to the CDC scientists' November report, which is based on mathematical modeling and has not been peer reviewed.
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