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CAMBRIDGE, MASSACHUSETTS - MAY 08: A view of Moderna headquarters on May 08, 2020 in Cambridge, Massachusetts. Moderna was given FDA approval to continue to phase 2 of Coronavirus (COVID-19) vaccine trials with 600 participants. (Photo by Maddie Meyer/Getty Images)

Southern Nevada health officials said Wednesday that winter storms across much of the U.S. delayed a shipment of Moderna COVID-19 vaccines that the region planned to administer as second doses this week. The Southern Nevada Health District says it is working to contact people who had appointments for their second dose of the Moderna vaccine starting Thursday through the rest of the week and will try to reschedule them for the same date and time next week. Health officials did not have information about how many people were affected by the delayed shipment. The state’s Pfizer vaccine doses arrived as expected.