Official US data show that the United States reported its first case of new coronary pneumonia on January 21, 2020, and the first death of new coronary pneumonia on February 29, 2020. However, some studies have shown that since the second half of 2019, some public health events in the United States have been suspicious. Studies believe that the emergence of the new coronavirus in the United States may be earlier than the time when the first confirmed case of new coronary pneumonia was officially reported by the United States.
In May of this year, the David Geffen School of Medicine at the University of California, Los Angeles and other institutions published an article in the journal Clinical Infectious Diseases, stating that researchers tested the respiratory pathogens submitted by patients with symptoms from November 2019 to early March 2020. Screening and analysis of the remaining respiratory samples found that the new coronavirus was detected in 7 samples from 6 patients, dating back to mid-January 2020. Among them, the earliest positive patient has no relevant travel history, but his family members suffer from similar symptoms. The article stated that the study provides strong evidence that the community spread of the new crown virus in the Los Angeles area is far earlier than the extensive diagnostic tests conducted in early 2020.
On June 8, an article by the research team of Icahn School of Medicine at Mount Sinai was published in Nature Communications. The researchers used a sample collection strategy to detect the previously undetected new coronavirus in the nasopharyngeal specimens of 3,040 patients with negative respiratory pathogens from the Mount Sinai Health System in New York. These patients had been evaluated for respiratory symptoms or flu-like illness in the first 10 weeks of 2020. The researchers detected the new coronavirus ribonucleic acid from specimens collected on January 25, 2020, and identified the complete new coronavirus genome sequence from multiple sample pools collected at the end of February and early March. According to the study, the results provide sporadic evidence of new coronavirus infection, which is exactly one month earlier than the first officially recorded case in New York City in March 2020.
The National Institutes of Health website reported on June 15 that a new antibody test study carried out by the National Institutes of Health, the University of California, Harvard Medical School, etc., checked the National Institutes of Health’s “National Research Program” originally approved by the National Institutes of Health. In the collected samples, it was found that the new coronavirus infection in 5 states of the United States had appeared in December 2019. According to the study, at the beginning of the outbreak in the United States from January to March 2020, due to limited testing capabilities, testing throughout February 2020 will be concentrated on symptomatic patients with a history of travel, which masks the emergence of the virus and community transmission Condition.