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While the supply of approved vaccines for the SARS-CoV-2 virus the strain of coronavirus that causes COVID-19 is limited, governments and health authorities are tasked with deciding who gets the vaccine first, second and last.
A number of competing priorities are considered, including minimizing deaths, stopping the spread of the virus and preserving the functionality of the health-care system.
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To reduce mortality, the vaccine should be targeted to seniors, while slowing transmission means prioritizing young adults, experts say.