Bridal expo briefly delays 2nd COVID-19 shots at Harvey Hall Health officials say briefly delaying shots wonât affect potency 2nd Dose Confusion By Blake Holland | February 3, 2021 at 7:03 PM CST - Updated February 4 at 8:23 AM TYLER, Texas (KLTV) - This coming Friday and Saturday will mark 28 days since the Tyler vaccine clinic, when many people got their first Moderna shot at Harvey Hall, meaning theyâre due for the next shot. NET Health officials say those second shots will be given a few days later than expected because of a previously booked event at the convention center. âHarvey Hall was already taken those two days, so we had to readjust,â said George Roberts, CEO of the Northeast Texas Public Health District.