Epidimiologist discusses what it takes for the COVID-19 to be effective | The World

While waiting for pharmaceutical companies to manufacture enough vaccines, some countries have had to be strategic about where the first doses will go. The World talks to Melbourne University epidemiologist Nancy Baxter on which looks to be the most effective, and how long will it take for the vaccines to have a significant effect in nations with rising numbers of cases like the United States and United Kingdom.

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