Speed coronavirus vaccine testing by deliberately infecting volunteers? Not so fast, some scientists warn.

Speed coronavirus vaccine testing by deliberately infecting volunteers? Racing for a COVID-19 vaccine PHOTO (COLOR) With record-setting speed, vaccinemakers take their first shots at the new coronavirus PHOTO (COLOR) The $1 billion bet: Pharma giant and U.S. government team up in all-out coronavirus vaccine p... PHOTO (COLOR) Can you put a price on COVID-19 options? Myron Levine, a vaccine researcher at the University of Maryland School of Medicine who has conducted challenge experiments for more than 40 years, doubts traditional clinical trials for COVID-19 vaccine candidates will be as slow as some fear. [Extracted from the article]