According to foreign media reports on the 20th, two European laboratories recently re-examined blood samples collected by the National Cancer Center in Milan, Italy before the outbreak of COVID-19, and the results showed that Covid-19 may have spread in Italy as early as October 2019. But researchers say more evidence is needed to prove it.
It is reported that this is the second time that the research center has made a similar statement. In November last year, they tested 959 blood samples of lung cancer collected before the outbreak, and the results showed that 111 people were positive for COVID-19 antibody. Therefore, researchers believe that the virus may have existed in northern Italy as early as the summer of 2019 and spread for several months.
VisMederi laboratory, Italy. According to the network
After learning this news, the World Health Organization asked Milan National Cancer Center to test samples again to verify the results. Subsequently, VisMederi Laboratory in Siena, Italy, and WHO affiliated institutions of Erasmus University in the Netherlands re-examined 29 original samples and control cases in 2018, and found that the coronavirus-related antibody IgM in 3 blood samples was positive, which was a sign of recent infection. The earliest sample was collected in October 2019.
“The retest results show that it seems credible that the virus has spread in Italy for a long time,” said Giovanni Apollo, one of the researchers. ”And if this is confirmed, it will explain why there will be so many symptomatic infections in Italy in 2020. Because Covid-19 or its earlier virus version has spread quietly in Italy. ”
Although virus antibody was found, the antibody content of three samples did not meet the standard for confirming COVID-19 infection. Marion Copmans, a professor of virology at Erasmus University, thinks that the results are ”interesting” and that it is ”not impossible” for patients to be infected with COVID-19, but some evidence is needed.
Paul hunter, a professor of medicine at the University of East Anglia, also said that the latest research results did not provide conclusive evidence, thinking that other coronaviruses that were popular at that time triggered antibody reactions, but said that ”the possibility of COVID-19 is not ruled out”.
This is not the first time that there is evidence that Covid-19 may have spread around the world earlier. The National Institutes of Health (NIH) claimed that Covid-19 appeared in the United States in December 2019. France indicated that COVID-19 antibody was found in serum samples collected in November 2019.
Post time: Sep-01-2021