During an interview set to air Thursday, the chairman of Pfizer Pharmaceutical told Dateline host Lester Holt that the company was “not certain” if the vaccine prevented the coronavirus from being transmitted.
“This is something that needs to be examined, we are not certain about that right now with what we know,” Albert Bourla told Holt after being asked if people can still transmit the virus after taking the vaccine, according to The Hill.
Holt questioned Bourla and other individuals involved in the development and distribution of the medicine.
Last month, Pfizer announced that its vaccine candidate had been shown to be more than 90 percent effective at preventing COVID-19 and has applied for emergency use authorization from the Food and Drug Administration (FDA).
The U.K. became the first country to approve Pfizer’s vaccine this week with the first round of immunizations expected to roll out next week.