Second dose vaccines rescheduled for next week

Houston – Harris County Public Health currently has a limited amount of COVID-19 vaccines due to the recent weather events. Although the second dose of the Moderna vaccine should be administered 28 days after receiving the first dose, it may be scheduled up to 6 weeks (42 days) after the first dose.  According to the Centers for Disease Control and Prevention (CDC) guidance, delay in receiving a second dose of COVID-19 vaccine does not impact the vaccines overall effectiveness. 

Only individuals with scheduled appointments will be honored at designated sites today and tomorrow, Saturday, Feb. 20th. For those who are due for their second dose appointment and have not been contacted yet, HCPH will contact you through email or text to schedule that appointment next week.  Please do not go to a vaccination site because you cannot be seen without a scheduled appointment/code.

Individuals who had their appointments cancelled due to vaccination site closures should have received a notification of the cancellation due to weather conditions and phone call to reschedule the appointment if an appointment was available for Saturday. All others that were cancelled and not given a new appointment for Saturday will be prioritized for a makeup appointment next week once HCPH receives additional vaccine.  If you do not receive a notification mid-next week, please contact 832-927-8787.

To sign up for free COVID-19 vaccinations through HCPH, please visit or call 832-927-8787. Harris County Public Health is still vaccinating individuals in Groups 1A and 1B. For full definitions of these categories and additional information regarding vaccines, please visit 

Thank you for your understanding and cooperation.