It might not be clear whether Covid-19 vaccines work until after they're already being used, experts warn

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It might not become clear which Covid-19 vaccines work best — or whether they work at all — until after they’ve already been authorized and are being given to many people, a team of experts says.

A health worker injects a woman during clinical trials for a Covid-19 vaccine at Research Centers of America in Hollywood, Florida, on September 9. Eva Marie Uzcategui/Bloomberg/Getty Images

With 44 vaccines in clinical trials -- meaning they are being tested in people -- it will be difficult to tell which ones are the most effective in preventing disease, said the experts led by Dr. Susanne Hodgson of Oxford University’s Jenner Institute. “Instead, data to address this end point might be available only from large phase 4 trials or epidemiological studies done after widespread deployment of a vaccine.”Prevention of severe infections:

“Only a small proportion of individuals infected with SARS-CoV-2 develop severe disease, which means an extremely large number of volunteers is needed in a clinical trial for there to be enough cases to get a reliable measure of vaccine efficacy,” study co-author Kate Emary, a researcher at the University of Oxford, said in a statement.

 

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So what you are saying is wait a year or two before getting it because it could be harmful and or useless.

The vaccine trial is a shama, they don't how effective it is because those in the trial are not supposed to expose themselves to the virus, how would you know it works, if you don't get exposed?

CNN your living proof that one can be a complete dolt.

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