![]() But they found it noteworthy that the seven did not live in or near New York City or Seattle, where the first wave of U.S. The NIH researchers have not followed up with study participants yet to see if any had traveled out of the U.S. “While it is entirely plausible that the virus was introduced into the United States much earlier than is usually appreciated, it does not mean that this is necessarily strong enough evidence to change how we’re thinking about this,” said William Hanage, a Harvard University expert on disease dynamics. Researchers in both the NIH and CDC studies used multiple types of tests to minimize false positive results, but some experts say it still is possible their 2019 positives were infections by other coronaviruses and not the pandemic strain. ![]() It can be difficult to distinguish antibodies that neutralize SARS-CoV-2, the virus that causes COVID-19, from antibodies that fight other coronaviruses, including some that cause the common cold. One of the Illinois cases was infected as early as Christmas Eve, said Keri Althoff, an associate professor at the Johns Hopkins Bloomberg School of Public Health and the study’s lead author. The researchers say seven study participants - three from Illinois, and one each from Massachusetts, Mississippi, Pennsylvania, and Wisconsin - were infected earlier than any COVID-19 case was originally reported in those states. Like the CDC study, these researchers looked for antibodies in the blood that are taken as evidence of coronavirus infection, and can be detected as early as two weeks after a person is first infected. They analyzed blood samples from more than 24,000 people across the country, collected in the first three months of 2020 as part of a long-term study called “All Of Us” that seeks to track 1 million Americans over years to study health. The latest study, published Tuesday online by the journal Clinical Infectious Diseases, is by a team including researchers at the National Institutes of Health. But research since then - including some done by the CDC - has suggested a small number of infections occurred earlier.Ī CDC-led study published in December 2020 that analyzed 7,000 samples from American Red Cross blood donations suggested the virus infected some Americans as early as the middle of December 2019. See if new cases are rising or declining as states reopen. outbreak arrived during a three-week window from mid-January to early February. New Cases of COVID-19 in US States Track COVID-19 Trends Across the U.S. ![]() 19.ĬDC officials initially said the spark that started the U.S. case of the 2019 novel coronavirus, which causes a disease known as COVID-19, is confirmed in a man from Washington State. infection to be identified was a traveler - a Washington state man who returned from Wuhan on Jan. Following a rapid spread from its origin in Wuhan, China, the first U.S. The pandemic coronavirus emerged in Wuhan, China in late 2019. ![]()
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