booster for people initially immunized with the pfizer vaccine produced a strong immune response with patients. this comes as cdc data show the pace of vaccinations is rising with an average of more than 2.2 million doses being stared daily. >> it's encouraging. we still have tens of millions who have chosen not to vaccinate themselves or their children in this country. >> reporter: as for the new york city mandate, just like with public employees, there will not be a testing option for private sector employees either. and that means that the mandate will also, we should tell you that that mandate will also apply to businesses where more than one person is employed. so that's a lot of people out there. >> it sure is. jason carroll, thank you for that report. let's discuss all of this with dr. ashish jha, the dean of brown university school of public health. dr. jha, thank you so much for joining me. so some new york business