A World Health Organization panel said it's best to give people two doses of the same Covid-19 vaccine, but mixing and matching is a good solution for countries facing supply constraints.
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(Bloomberg) New restrictions are showing up across the world as authorities try to stem the spread of the omicron strain of Covid-19. France shut nightclubs for four weeks, New York City called for a private sector vaccine mandate and Hong Kong imposed quarantine requirements on more countries.
Mixing other vaccines with those from AstraZeneca Plc or Pfizer Inc. offers at least as effective protection against Covid-19 as giving two doses of the same shots, a UK study found.
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