matthew karnicia nick, chief, you're correspondent for politico here in berlin. matthew, we appreciate your time tonight. thank you. thank you. oh, the us food and drug administration is authorized. the 2nd booster dose of the 2 most commonly used cobra. 1900 vaccines. people over 50 will now be able to get a 4th dose of the mid during the, or pfizer vaccines. the move comes after data showing syncing immunity and vaccinated people and the risks posed by omicron variance of the virus. the white house is welcome to move. this is a good thing and it is a straightforward thing. the cdc and the f d a r. now allowing, i will make available booster shots a 4th shot for people over 50 for the and, and for the immunocompromised. this is, we have plenty of supply and to ensure that those populations can receive the shots . and i want to bring in doctor william shafter, he's a professor of preventive medicine at the department of health policies professor of medicine also at the vanderbilt university school of medicine in nashville, tennessee. dr. shepherd, good to see you