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RIO DE JANEIRO, BRAZIL - As coronavirus vaccines started rolling out late last year, there was a palpable sense of excitement. People began browsing travel websites and airlines grew optimistic about flying again. Ryanair Holdings Plc even launched a “Jab & Go” campaign alongside images of 20-somethings on holiday, drinks in hand

It’s not working out that way.

For a start, it isn’t clear that the vaccines actually stop travelers spreading the disease, even if they’re less likely to catch it themselves. Neither are the shots proven effective against the more-infectious mutant strains that have startled . . .

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