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>> duncan: tonight covid-19 remains in retreat in nearly every state with new infections down about the 0 percent from the january peak. the number of vaccinated americans is higher each day, the cdc says it 5 approximate million paryns have had at least one dose. now the science behind some of those vaccines could be deployed against other deadly diseases. dr. jon lapook takes us to the lab. >> reporter: the pfizer and moderna vaccine went from blue print to rollout fast. but not as fast as man...