market s watching that closely. nancy cordes, thank you. we turn now to the covid pandemic. today, dr. francis collins, the director of the national institutes of health, said he s stepping down at the end of the year. president biden called collins one of the most important scientists of our time. and there s big news tonight about a new covid booster shot. here s cbs meg oliver. reporter: johnson & johnson is the latest company to ask the f.d.a. for emergency use authorization for their covid-19 booster shot for adults 18 and over. dr. eric topol: the johnson & johnson is now in 15 million americans. they got the one shot and done, but they weren t really done, because the efficacy isn t as high as the other vaccines. reporter: the johnson & johnson single-dose vaccine was only 71% effective against hospitalization from covid, but recent data found a j&j booster shot given 56 days after the primary dose provided 94% protection against illness and