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According to the traceability study released by the US CDC, scientists studying covid-19 began to trace the wastewater in New York City in the summer of 2020, and sequenced the viruses found in the wastewater samples. On November 21, they conducted routine sampling and sent it for inspection two days later. The results were obtained in early December. At that time, the epidemic caused by the "Omicron" strain had broken out, and the researchers "recognized (the samples showed) the unique mutation characteristics of the new mutant strain at a glance". In addition, in California and Texas, the researchers also found evidence of the existence of "Omicron" in the wastewater samples at the end of November. This shows that "Omicron" began to spread in New York, the United States, earlier than South Africa.