Molnupiravir in production (Merck)

Sci­en­tist be­hind Mer­ck­'s Covid pill: We need to watch out for re­sis­tance

When Mark Deni­son awoke this month to learn that an­oth­er one of the drugs from his lab had proven ef­fec­tive against Covid-19, two thoughts rushed through his mind.

“I was so ex­cit­ed to hear that it had this po­ten­tial,” he said. “And then I thought: Our re­sis­tance work is more im­por­tant than ever.”

Deni­son, 66, is ar­guably the sci­en­tist most re­spon­si­ble for mol­nupi­ravir, the pill Mer­ck an­nounced last week cut the risk of hos­pi­tal­iza­tion or death in new­ly di­ag­nosed Covid-19 pa­tients by 50%. It came to his Van­der­bilt lab along­side an­oth­er mol­e­cule known as 3a — or, as it was lat­er rechris­tened, remde­sivir —  in the years af­ter the 2012 MERS out­break, as Deni­son worked to iden­ti­fy drugs that could be de­ployed in the event of an­oth­er dead­ly coro­n­avirus spillover.

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