In the face of rising rates of the Omicron variant in its community the Israeli Government has approved a fourth vaccine dose for covid-19. It is one of the first countries in the world to do so and it marks a new phase for a country which was originally held up as a gold standard for management of the virus. It's also a bit of a test. Will another round of boosters have a profound effect against Omicron or not? Sebastian Usher is a middle east analyst and editor for the BBC World Service.
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