Vaccine Trials ‘Can’t Detect’ Virus Risk Reduction

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None of the trials of COVId-19 candidate vaccines can detect a reduction in serious outcomes such as hospitalization or death, a leading public health expert said Thursday.

Writing in the BMJ medical journal, associate editor Peter Doshi warned that not even phase 3 trials under way in the race for a vaccine can prove their product will prevent people contracting COVID-19.

In a sobering essay, Doshi said those hoping for a breakthrough to end the pandemic would be disappointed, with some vaccines likely to reduce the risk of infection by only 30 percent.

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