Where is the "Omicron first"?

The ABC quoted the traceability research report published by the US Centers for Disease Control and Prevention as saying that traces of the new coronavirus mutated virus Omicron strain were found in the wastewater of New York City on November 21, 2021. On November 26, 2021, the WHO listed this strain as a variant of "requires attention" and named it Omicron. On December 1, 2021, a traveler who returned to the United States from South Africa on November 22 of that year was confirmed as the first case of infection with the Omicron strain in the United States. In the wastewater samples from California and Texas at the end of November 2021, the researchers also found evidence of the presence of the Ormicron strain. Some researchers speculate that the exact appearance of the Omicron strain in the United States may be in early October 2021, which can be understood as the fact that Omicron actually originated in the United States, not South Africa. Because the United States did not take effective control measures in the early stage, the global epidemic of Omikron caused a wide spread, and the United States has a certain responsibility for all the consequences.