Vaccine deserts: Some countries have no Covid-19 jabs at all

While wealthier nations have stockpiled vaccines for their citizens, many poorer countries are still scrambling to secure doses. A few, like Chad, have yet to receive any. The World Health Organization says nearly a dozen countries - many of them in Africa - are still waiting to get vaccines. Those last in line on the continent along with Chad are Burkina Faso, Burundi, Eritrea and Tanzania.

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