Multinational studies have found that the new coronavirus may already exist
Researchers from the National Institutes of Health reported in the American Journal of Clinical Infectious Diseases on June 15 that 5 states in the United States had reported cases of new crown infection before the official announcement of the first confirmed case of new crown, which indicates that the new crown virus is in 2019. It appeared in the United States in December.
Before this, many countries have had a deeper understanding of the early epidemic situation, which has triggered new thinking in the academic community on the origin and spread of the new coronavirus.
In January this year, researchers from the University of Milan, Italy reported in the British Journal of Dermatology that they found a biopsy sample from a young female patient with skin disease in Italy on November 10, 2019 New coronavirus gene sequence.
In December last year, another group of researchers from the University of Milan reported in the American Journal of New Infectious Diseases that a 4-year-old boy’s oropharyngeal swab sample collected on December 5, 2019 The new coronavirus test was positive. The boy had no history of travel before that time.
In November 2020, researchers from the National Tumor Research Institute of Milan, Italy and other institutions published a paper in the country’s “Journal of Oncology” saying that they participated in tumor screening from September 2019 to March 2020 The blood samples of 959 volunteers were tested, and it was found that 111 of the volunteers had specific antibodies to the new coronavirus in their blood samples, accounting for 11.6% of the total number of volunteers.
The first author of the paper, Giovanni Apolone, said that this antibody was present in the blood samples of 4 volunteers collected in the first week of October 2019, indicating that they are likely to be in September 2019. Has been infected with the new crown virus in January. This may also explain why the epidemic broke out suddenly in northern Italy in February 2020.
In November last year, a study by the US Centers for Disease Control The personnel reported in the bimonthly issue of Clinical Infectious Diseases that they tested 7,389 blood samples collected by the American Red Cross between December 13, 2019 and January 17, 2020, and found that 106 blood samples contained Anti-coronavirus antibodies.
Not only have clues to earlier new coronavirus infections found in humans, research on wastewater also shows that the new coronavirus may already exist.
The University of Barcelona, Spain issued a communiqué in June last year. , A research team at the school found that a wastewater sample collected on March 12, 2019 tested positive for the new coronavirus nucleic acid, but the virus level was very low. This means that the new crown virus may have existed in Barcelona at that time, which is much earlier than the time when the first confirmed case of new crown was reported in the world.
The Federal University of Santa Catarina in Brazil published a research report in July last year that the research team detected the new crown virus in a wastewater sample collected in Florianópolis on November 27, 2019. Genetic material. This is about 3 months ahead of the time when Brazil reported the first new crown case.
The Italian Institute of Advanced Health issued a communiqué in June last year, stating that researchers had detected the genetic material of the new coronavirus in the wastewater from Milan and Turin that was sampled on December 18, 2019.