Covid vaccine makers may need to infect subjects to get results ...Middle East

Drugmakers sprinting to deliver potential Covid-19 vaccines say they're facing a new hurdle: declining infection rates that could make it hard to test their shots. If the disease ebbs further in some regions, not enough people will be exposed to the coronavirus to make studies possible. Researchers may have to consider deliberately infecting healthy volunteers with the virus.

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Covid vaccine makers may need to infect subjects to get results ...Middle East

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