The Centers for Disease Control and Prevention (CDC) on Friday said the first known Omicron COVID-19 case in the United States was discovered in a person who traveled internationally and had symptoms starting Nov. 15. The World Health Organization (WHO) named the variant on Nov. 26 as one “of concern.” Authorities in California reported what was thought to be the first U.S. case on Dec. 1 after an international traveler on Nov. 22 traveled from South Africa to San Francisco and developed symptoms. “The earliest date of symptom onset was November 15 in a person with a history of international travel,” said the CDC in a revision of its timeline detailing Omicron’s spread in the United States. No deaths have been associated with the Omicron variant anywhere in the world. The CDC update said 22 states confirmed at least one Omicron case, and some of the cases indicate that community …