IN 2000 AMERICA declared measles "eliminated", meaning that the virus was no longer indigenous and any new infections were linked to strains brought in from abroad. In the following decade measles in America remained rare. Now cases are on the rise again. There were 372 in 2018, the second highest number since 1996. Over 200 were reported in the first two months of this year. Though the disease is rarely deadly, it often requires hospitalisation.
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