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Chris Richards/University of Arizona In the United States, more people have been at least partially vaccinated against SARS-CoV-2 – the virus that causes COVID-19 – than have contracted it. To date, over 27.4 million confirmed cases of COVID-19 have been reported, while 38.3 million people have received at least one dose of the vaccine, according to the Centers for Disease Control and Prevention. In Arizona, nearly 800,000 COVID-19 cases have been reported to date, while more than 840,000 people have received at least one shot. Yet, this is just the beginning of the battle. The number of confirmed cases per day is falling nationally, and the trend should continue as the vaccine reaches more people. But many scientists agree that for the population to reach herd immunity, at least 70% of people should receive both doses of the currently available Pfizer or Moderna vaccines.

South africaUnited statesUniversity of arizonaDeepta bhattacharyaCenters for diseaseUniversity communicationsChris richards university of arizonaArizona department of health servicesUniversity of arizona campus mallDepartment of immunobiologyMore answersMikayla mace kelleyDisease controlArizona departmentHealth servicesPriority phase