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The arrival of the omicron variant of the coronavirus in the U.S. has health officials in some communities reviving contact tracing operations in an attempt to slow and better understand its spread as scientists study how contagious it is and whether it can thwart vaccines.

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THE HAGUE, Netherlands (AP) — South African scientists are warning that reinfections among people who’ve already battled COVID-19 appear to be more likely with the new omicron variant than with earlier coronavirus mutants.

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While all eyes are on the new and little-understood omicron variant that is popping up around the country, the delta form of the coronavirus isn't finished wreaking havoc in the U.S., swamping hospitals with record numbers of patients in the Midwest and New England.