>> reporter: dr. peter hotez is with the baylor college of medicine. >> it's really important not to go rogue, and to do this with the recommendations of both the food and drug administration and the centers for disease control. but i think it's very important to get that third immunization after a six- to eight-month period, because we are seeing a lot of breakthrough infections, breakthrough hospitalizations. >> reporter: the texas state fair starts tomorrow, an event that attracted more than two million visitors pre-covid. well, this year, by the midway, you can get a corn dog and the pfizer booster shot. a decision on the j&j and moderna booster shots is expected soon. margaret. >> brennan: thank you, omar. breaking tonight, a federal arrest warrant has been issued for brian laundrie, the fiancé of gabby petito, that 22-year- old whose body was found last weekend. laundrie hasn't been seen in more than a week. cbs's jericka duncan is covering