Health & Fitness COVID-19 may have arrived in US by December 2019

02:40  02 december  2020
02:40  02 december  2020 Source:   livescience.com

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The deadly coronavirus may have circulated in the United States as early as December Florida Covid - 19 cases increase in children as schools reopen. started in late November / early December in China so there's absolutely no way the virus could have been spreading widely in December 2019 .

The study suggests that COVID - 19 arrived in the U . S . far before the official first case on Jan. Testing has found Covid - 19 infections in the U . S . in December 2019 , according to a study , providing further “The findings of this report suggest that SARS-CoV-2 infections may have been present in the U . S . in

COVID-19 may have already arrived in the United States by December 2019, before the disease was even identified in China, a new study suggests.

A lab technician holding a blood sample. © Provided by Live Science A lab technician holding a blood sample.

The study researchers, from the Centers for Disease Control and Prevention (CDC), analyzed more than 7,000 blood donations collected by the American Red Cross in nine states between Dec. 13, 2019 and Jan. 17, 2020. Of those, 106 samples tested positive for antibodies against SARS-CoV-2, the virus that causes COVID-19.

The findings suggest "SARS-CoV-2 infections may have been present in the U.S. in December 2019, earlier than previously recognized," the authors wrote in their paper, published Monday (Nov. 30) in the journal Clinical Infectious Diseases.

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This article documents the chronology and epidemiology in 2019 of SARS-CoV-2, the virus that causes coronavirus disease 2019 ( COVID - 19 ) and is responsible for the COVID - 19 pandemic.

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Officials in China first reported a cluster of mysterious pneumonia cases in Wuhan, which would turn out to be caused by COVID-19, on Dec. 31, 2019. In the United States, the first confirmed case of COVID-19 was reported on Jan. 20, 2020 in a resident of Washington state who had recently traveled to China.

But there have been hints that the virus was circulating earlier than recognized. A case of COVID-19 in China was reportedly traced back to Nov. 17, 2019, Live Science previously reported. In France, retrospective testing of samples from hospitalized patients revealed a patient infected in late December 2019. And researchers have found SARS-CoV-2 antibodies in blood samples collected in Italy in September, Live Science previously reported.

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In the new study, of the 106 samples that tested positive for SARS-CoV-2 antibodies, 39 were collected from California, Oregon and Washington between Dec. 13 and Dec. 16, 2019; and 67 were collected from Connecticut, Iowa, Massachusetts, Michigan, Rhode Island and Wisconsin between Dec. 30, 2019 and Jan. 17, 2020.

Positive antibody tests suggest a prior infection with COVID-19, but they cannot prove that a person was infected. There's a chance that antibodies against other coronaviruses may "cross-react" to give a positive result. But when the researchers performed additional tests to account for such cross-reactivity, they found that 84 out of 90 samples tested had antibodies that were specific for SARS-CoV-2.

The authors also used a highly accurate test for SARS-CoV-2 antibodies. But even very accurate tests still produce a small number of false positive results. However, the number of positive results in the new study was higher than would be expected from false positives alone, the researchers wrote.

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Since 31 December 2019 and as of 29 November 2020, 62 271 031 cases of COVID - 19 (in accordance with the applied case definitions and testing strategies in The downloadable data file is updated daily and contains the latest available public data on COVID - 19 . You may use the data in line with ECDC’s

The virus that causes COVID - 19 was present in samples from Milan and Turin on December 18 and in Bologna on January 29. "This research may help to understand the beginning of the virus's circulation in Italy," the ISS said in a statement. The Italian report follows similar findings in other

Overall, these findings "make it very unlikely that all reactive specimens [positive results] represent false positives," the authors concluded. In other words, at least some of these positives from December 2019 and early January 2020 were likely due to prior COVID-19 infections.

However, even though the authors tried to measure antibodies that were specific to SARS-CoV-2, "cross-reactivity with other coronaviruses" can't be ruled out, Dr. George Rutherford, professor of epidemiology and biostatistics at the University of California, San Francisco, told Live Science. And even if these were true COVID-19 infections, the study cannot determine where the participants acquired the infection — it's possible that some blood donors in the study had recently traveled to China and were infected there, Rutherford noted. (The current study did not have information on if and where the donors had traveled.)

In addition, because of limitations of the study, the findings can't reveal how much the virus was circulating at that time.

To confirm the findings, human tissue, saliva or blood samples from that time should be tested for traces of genetic material from the SARS-CoV-2 virus, the authors said. Rutherford added that donors could be contacted in future studies, which could provide information on whether they had traveled or experienced symptoms similar to those of COVID-19.

Originally published on Live Science.

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