HOUSTON – Earlier this week we watched as the Pfizer vaccinations began locally and nationally and the FDA said both vaccines are almost equal at being effective. Pfizer administered 21 days apart, Moderna will be 28 days. Pfizer can only thaw to refrigerated temps for five days before it expires. However, Kroger said their pharmacies are actually planning to get the Pfizer vaccine next week. “They’re over 900 vaccines per case, they can stay in that case for over two weeks.