By Ahmed Aboulenein and Katharine Jackson WASHINGTON (Reuters) -Americans vaccinated and boosted against COVID-19 can be with family over the holidays but attending large gatherings is not safe, even for those who received a booster dose, top U.S. infectious disease expert Anthony Fauci said on Wednesday. The United States faces a second Christmas of upended holiday plans, with a surge in infections fueled by the now-dominant Omicron variant of the coronavirus forcing many to cancel travel, reconsider visiting loved ones, and question attending holiday parties. “There are many of these parties…

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