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| U. Xinhua News Agency, Washington, June 15 (Reporter Tan Jingjing) Researchers from the National Institutes of Health reported in the American Journal of Clinical Infectious Diseases on the 15th that five U. The National Institutes of Health said in a statement that the findings also support the same findings from the Centers for Disease Control and Prevention Natalie Thornberg, chief researcher of the respiratory virus immunology team of the US Centers for Disease Control and Prevention, commented in an interview with US media that these studies are consistent, and the United States is likely to have rare sporadic cases earlier Researchers from the National Institutes of Health tested and analyzed 24,079 blood samples collected from 50 states across the United States from January 2 to March 18, 2020 It was found that 9 samples were positive for antibodies, of which 7 were positive cases from Illinois, Massachusetts, Wisconsin, Pennsylvania and Mississippi, earlier than the time of the first confirmed case announced by these 5 states The paper pointed out that the earliest samples that tested positive were those collected in Illinois on January 7, 2020 The median time from infection with the new coronavirus to the appearance of antibodies is 14 days, which indicates that the new coronavirus may have appeared in Illinois as early as December 24, 2019 Kerry Althoff, the lead author of the study and an associate professor at the Johns Hopkins University School of Public Health in the United States, said that due to limited testing, the public health department may not be able to detect the new coronavirus outside of known areas. Testing for new coronavirus antibodies on blood samples helps to better understand the spread of the new coronavirus in the early stages of the outbreak in the United States Focus on the new crown pneumonia epidemic
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