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Hawaii says a vaccinated Oahu resident who travelled to Nevada last month has tested positive for the delta variant of Covid-19.
The delta variant was first detected in India and is a more transmissible version of the disease. The variant currently makes up 6 per cent of all cases in the US.
Hawaii Health Director Dr. Libby Char says this is a “very rare breakthrough” case in which a Covid-19 vaccine didn't prevent infection.
New analysis from researchers in the UK shows the Pfizer vaccine is 96% effective against hospitalization from the delta variant.
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