The coronavirus variant that was first spotted last month in the U.K. has now spread to dozens of countries, likely passed on by infected people who traveled around the world and unknowingly brought the microscopic invaders with them.
Israel has given vaccinations against coronavirus to more than one million people, the highest rate in the world, as global immunisation efforts step up.
Nearly a year into the coronavirus pandemic, the perplexing problems of Covid-19 long-haulers seem no nearer resolution — or even explanation — than when they first puzzled doctors and patients in the spring.
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