a plant in baltimore, where to now not a single dose had been approved because of a quality control issue. the shelf life was also extended this week to 4 1/2 months. joining me now is the former batch more health commissioner, dr. leana wen. you got the j&j vaccine yourself, so for anyone who might still be on the fence, what would you say? >> we have thrive vaccines here in the u.s. that have been proved to go effective johnson & johnson has the benefit of a one-dote vaccine, if you're a young woman under the age of 50, you may consider either of the other two, but all of the investigation thus far i think