New crown virus research findings have been released in many countries

At present, the global scientific research on the outbreak of neo-crown pneumonia continues to deepen, multi-national research institutions issued new findings of new coronavirus research, rewrite the timeline of the development of the epidemic, and deepen the understanding of the origin and spread of the new coronavirus.
November 30, 2020, CDC researchers report in the semi-monthly journal Clinical Infectious Diseases that new coronavirus antibodies were present in blood donation samples from some Americans in December 2019, meaning that the new coronavirus may have appeared in the United States by then, earlier than the first confirmed case of new coronary pneumonia officially reported in the United States -- January 21, 2020.
the study, CDC researchers tested 7,389 blood samples collected by the American Red Cross between December 13, 2019 and January 17, 2020 from donors in nine U.S. states. The results showed that 106 blood samples contained antibodies to the new coronavirus, of which 39 were collected from 13 December to 16 December 2019 and 67 from 30 December 2019 to 17 January 2020. The study says there may have been individual cases of new coronavirus infections in some parts of the United States in December 2019, and that a small number of people may have previously had antibodies in their bodies that bind to the new coronavirus.
Yves Coen, head of the intensive care unit at two hospitals affiliated with the Paris Public Hospital Group, said his hospital had retested samples taken from 24 patients with pneumonia between December 2019 and January 2020. It turned out that a man admitted to hospital on 27 December 2019 had tested positive for the new coronavirus. He had no travel activities for some time before he fell ill. Yves Coen's team, which published a paper online last year in the International Journal of Antimicrobial Preparations, said there was evidence that the new coronavirus had spread in France in late December 2019 before it was officially reported. The French government announced that the first confirmed case of neo-crown pneumonia was on January 24 last year, when the first confirmed case of new coronary pneumonia was reported in Europe.
January 12 this year, the health department of the Brazilian state of Espirito Santo announced that the state had detected new coronavirus-specific IgG antibodies in serum samples taken in December 2019. The state tested positive for new coronavirus-specific antibodies in 7,370 serum samples taken between December 1, 2019 and June 30, 2020, resulting in 210 blood samples that were positive for new coronary IgG antibodies, 16 of which occurred before Brazil reported the first case of new coronary pneumonia on February 26, 2020, and the earliest one on December 18, 2019. The state health department said it would take some time for a new coronavirus-specific IgG antibody to test positive, so the sampled patient could be exposed to the new coronavirus by late November or early December 2019.
an international team led by the University of Milan in Italy reported in the British Journal of Dermatology that they had found the genetic sequence of the new coronavirus from a biopsy sample taken on November 10, 2019 by a young female dermatology patient in the country. The results bring forward the emergence of Patient Zero in Italy until November 2019. The first confirmed case of neo-crown pneumonia was reported in Italy on 30 January last year and the first local case was reported on 21 February last year.
team of researchers at the University of Milan reported in December in the American Journal of New Infectious Diseases that they had tested 39 oral swab samples taken between September 2019 and February 2020 from patients with suspected measles. It turned out that a sample of a 4-year-old boy living near Milan, Italy, had tested positive for the new coronavirus.
the oral swab sample was taken on December 5, 2019, and the boy had no travel history for some time. The researchers believe the case is significantly earlier than Italy's officially announced diagnosis of the country's first new case of coronary pneumonia, and speculate that new cases of coronary pneumonia may have occurred in Italy and other European countries by the end of autumn 2019.
, studies of wastewater have shown that the new coronavirus may already be present.
Spain reported its first confirmed case of neo-crown pneumonia on 31 January 2020 and its first indigenous case on 25 February 2020, but researchers in the country found traces of the new coronavirus in wastewater samples taken on 12 March 2019. A team of researchers led by the University of Barcelona in Spain analyzed wastewater samples from January 2018 to December 2019 and found that the wastewater samples taken on March 12, 2019 tested positive for neovirus nucleic acid, the University of Barcelona said in a statement on June 26 last year. This means that the new coronavirus may have existed in Barcelona at the time.
A team led by the Federal University of Santa Catarina in Brazil, published on July 2 last year, found genetic material for the new coronavirus in wastewater samples collected on November 27, 2019 in Florianopolis, the capital of Santa Catarina state. This is about two months ahead of the time when the first case of new coronary pneumonia was reported in the Americas and about three months earlier than the time when Brazil reported the first case of new coronary pneumonia.
(Washington, Paris, Rio de Janeiro, Rome, Madrid, Beijing, January 18, by reporter Li Zhiwei, Liu Lingling, Li Xiaoxuan, Ye Wei, Jiang Bo, Liu Ge)