U.S. Got More Confirmed “Index Cases” of Coronavirus From Europe Than From China - The Intercept

When pressed about his delayed response to the coronavirus pandemic, President Trump has repeatedly cited the U.S. travel restrictions imposed on China, which went into effect on February 1. “Something we did very well is when we stopped the inflow from China at a very early level,” Trump said on March 29. “That was a good thing to do, a great thing to do.”

What Trump doesn’t mention, however, is his administration’s failure to restrict travelers from Europe until it was too late. An investigation by The Intercept shows that travel from Europe was a key facilitator of the virus’s spread in the U.S. — a large amount of the first Covid-19 cases in the U.S. can be traced to Europe. While the China restrictions operated as an attempt to close the front door to infections from the nation where the pandemic started, the back door — travel from Europe, where the virus took hold particularly fiercely in Italy — remained wide open until the middle of March and can be connected to a surge of cases in the U.S., especially in the New York area.

The Intercept reviewed hundreds of media reports detailing the first recorded coronavirus cases — known as the “index cases” — in U.S. states and territories. European travel preceded the index cases in at least 13 states and territories, compared to only five from China. There were more imported index cases from cruise ships (six) than from China, while Italy accounted for at least 10 of the first Covid-19 cases.

For instance, Missouri’s first case was a young woman who studied abroad in Italy, while a high school trip to Milan was behind Rhode Island’s index case. Travelers from Italy brought it to Florida, Georgia, Oklahoma, Colorado, New Hampshire, and South Carolina. Italian tourists brought Covid-19 to Puerto Rico, and a Navy reservist stationed in Italy brought it to Maine.

A review of the known index cases also shows that the coronavirus often spread from the northeastern United States, indicating a chain of transmission from China to Europe to the east coast of the U.S., and from there to other U.S. states. Many state governments have declined to publicly share data on the provenance of their early cases, but some, like New Mexico, Kansas, North Dakota, and Idaho, confirmed that their first cases had links to New York or the northeastern U.S.

Index Cases in the United States

Total
China	5
Cruise ships	6
Italy	10
Other Europe	3
Total Europe	13

From February 1 to when flight restrictions went into effect on the Schengen zone (the 26 European states without internal border checks) and Britain and Ireland, on March 14 and March 17 respectively, more than 10,000 direct flights from Europe had arrived in 12 major American airports, according to data from tracking agency FlightAware. Though this number includes some cargo flights, their proportion to passenger flights is very low. Occupancy data from Air France/KLM shows that those flights might have carried an estimated 1,000,000 people into the country.

In the six weeks prior to the European travel bans, the U.S. was exposed to a massive amount of travelers from a highly infected region. During that time, there were almost no checks in international airports for passengers coming from Europe, as American authorities focused their screening efforts on China travelers. The China travel restrictions were mostly cosmetic anyway—the Chinese government banned flights from the Hubei region on January 23 and was sharply reducing its cases through harsh lockdowns and quarantines.

The Trump administration appears to have considered — and rejected — an early European travel ban in January. The Washington Post reported that Matthew Pottinger, the deputy national security advisor, had proposed a travel ban on affected European countries in late January, which was supported by health officials but was rebuffed by President Trump and Treasury Secretary Steven Mnuchin. As Trump faces increased criticism for a period of calamitous early inaction, he has sought to focus the blame on China, and on Saturday he published a tweet trying to discredit a New York Times story on the role of European travel in New York’s epidemic.

The impact from Europe was particularly acute on the east coast of the U.S., where many of those flights landed. From February 5 to the implementation of the travel bans on March 14 and March 17, nearly 4,000 direct flights from Europe arrived at New York’s John F. Kennedy Airport and Newark Liberty International in New Jersey, far more than any other metropolitan area in the country. San Francisco, by contrast, where the caseload has been kept relatively low, had a little over 600 flights from Europe in that same time period. While San Francisco also took stricter preventative measures earlier on, like issuing its stay-at-home order five days before New York did, it was also subject to less exposure overall.

Six weeks of coronavirus exposure from Europe

Destination airport	Date	Original departure	Numbers of flights
JFK Airport	2/5 to 3/13	Schengen	1569
	2/5 to 3/16	UK and Ireland	1189
		Total	2758
O’Hare International Airport	2/5 to 3/13	Schengen	585
	2/5 to 3/16	UK and Ireland	188
		Total	773
San Francisco International Airport	2/5 to 3/13	Schengen	351
	2/5 to 3/16	UK and Ireland	278
		Total	629
Los Angeles International Airport	2/5 to 3/13	Schengen	264
	2/5 to 3/16	UK and Ireland	419
		Total	683
Seattle-Tacoma International Airport	2/5 to 3/13	Schengen	147
	2/5 to 3/16	UK and Ireland	114
		Total	261
Hartsfield-Jackson Atlanta International Airport	2/5 to 3/13	Schengen	563
	2/5 to 3/16	UK and Ireland	183
		Total	746
Newark Liberty International Airport	2/5 to 3/13	Schengen	861
	2/5 to 3/16	UK and Ireland	448
		Total	1200
Washington Dulles International Airport	2/5 to 3/13	Schengen	525
	2/5 to 3/16	UK and Ireland	310
		Total	809
Boston Logan International Airport	2/5 to 3/13	Schengen	305
	2/5 to 3/16	UK and Ireland	401
		Total	706
Dallas/Fort Worth International Airport	2/5 to 3/13	Schengen	104
	2/5 to 3/16	UK and Ireland	171
		Total	275
Detroit Metropolitan Wayne County Airport	2/5 to 3/13	Schengen	247
	2/5 to 3/16	UK and Ireland	39
		Total	286
Miami International Airport	2/5 to 3/13	Schengen	661
	2/5 to 3/16	UK and Ireland	276
		Total	916
		Total flights from Schengen and UK to USA	10042

Source: Courtesy of FlightAware

A new study by researchers at NYU Grossman School of Medicine shows that, out of 91 patients studied, the vast majority of New York City’s coronavirus strains were identical to ones found in Europe. This provides additional evidence that Europe was the main source of Covid-19 in what became the pandemic’s global epicenter.

“We found that multiple chains of transmission were coming about two thirds from Europe, and the other third some from Asia and some from within other states of the United States,” said Dr. Adriana Heguy, director of the Genome Technology Center at NYU Langone and leader of the sequencing team. The proportion of strains from China was low, while there were many different European countries present. “You name the European country and it basically shows up: France, Austria, Netherlands, Italy, Madrid, I believe we had one. It was from everywhere in Europe,” she said.

Dr. Heguy said that the volume of flights from Europe is “probably the most likely explanation” for why New York City became the pandemic’s epicenter, adding that the virus might have been spreading in the U.S. from late January. “It’s very possible that there was already community transmission going on six to eight weeks” before recorded index cases, she said.

Britain was one of the last European countries to implement preventative measures like strict lockdowns, and has paid the price with some 10,000 deaths and the intensive care hospitalization of its prime minister, Boris Johnson (who is now out of the hospital). Among the nations of Europe, Britain has by far the most extensive air links to the U.S. There were at least 3,211 flights from London to the U.S. from February 5 to March 17, accounting for nearly a third of total European flights to the U.S. during that time frame. This means that one of the European countries that presented the biggest risks to the U.S. was actually excluded from the first European travel ban.

Even when the European travel bans were implemented, flights from Europe still carried a large number of Americans from virus hotspots, because U.S. citizens were not subject to them. There have been at least 246 flights from Britain, Ireland, and the Schengen zone to JFK alone after the bans. There are more daily flights from Europe than from China.

When the European travel bans went into place, TSA checks were implemented at U.S. airports, forcing some passengers to wait for hours in crowded airports, fill out forms and answer questions from officials in protective gear. Bottlenecks formed at arrival terminals, potentially further fueling the spread of the outbreak as thousands of travelers from affected countries crammed together in tight spaces. In other words, even when a ban was belatedly imposed, it was done in a way that likely increased the number of people exposed to the virus.

When Cherie Saulter, a PhD student at American University, flew from Lisbon, Portugal to Washington, D.C. on March 15, she and her other passengers were given printouts from the Centers for Disease Control with basic information on the coronavirus. They waited for 1.5 hours to clear a crowded customs area. “The majority of people were not social distancing,” Saulter told The Intercept. “It would have been pretty impossible to stay six feet away from people on all sides because of the way the lines were set up.”

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U.S. Got More Confirmed “Index Cases” of Coronavirus From Europe Than From China - The Intercept
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