First Covid vaccine shot alone not protective, Chile study shows ...Middle East

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First Covid vaccine shot alone not protective, Chile study shows
SANTIAGO: A study in Chile, which has one of the furthest-advanced vaccination campaigns in South America — mainly with China’s Coronavac, has found that a first dose alone does not protect against coronavirus infection.The study by the University of Chile found inoculation to be 56.5 per cent effective in protecting recipients two weeks after the second dose, and 27.7 per cent effective within the first two weeks.But for a single dose, efficacy in the 28 days between the first and second dose was only three per cent — on par with the margin of error in such studies, it said.Researchers looked at the combined effect of Coronavac, which accounts for about 93 per cent of doses being administer

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