By Matt Spetalnick and Susan Heavey WASHINGTON (Reuters) -The Omicron variant of the coronavirus has spread to about one-third of U.S. states, but the Delta version remains the majority of COVID-19 cases nationwide, U.S. health officials said on Sunday. Though the emergence of the new variant has caused alarm worldwide, Dr. Anthony Fauci, the top U.S. infectious disease official, told CNN “thus far it does not look like there’s a great degree of severity to it” but he added that it was too early to draw definitive conclusions and more study is needed. Fauci also hoped the United States would l…

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