US chief infectious disease expert Anthony Fauci said on Friday that an approved coronavirus vaccine may end up being effective only 50 to 60 percent of the time, which means public health measures are still needed to control the disease. The epidemic ..

"But the probability that they will be 98 percent effective is not great, which means that public health measures should not be abandoned," Fauci said in a webinar hosted by Brown University.

The new Corona virus has infected nearly 5 million people in the United States and killed more than 160,000 people.

The lockdown measures imposed to prevent the spread of the virus have severely damaged the economy, which has suffered the biggest blow since the Great Depression in the second quarter, with gross domestic product falling at its most severe pace in at least 73 years.

With infection rates rising across the country after states began to reopen businesses, public health experts, including Fauchi, stressed the importance of steps every American could take, including social distancing, hand-washing and wearing masks.

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