HCPH to Revamp Vacstrac System to include 2nd Booster Dose Appointment Scheduling
Harris County Public Health (HCPH) will begin administering the 2nd booster dose of Pfizer and Moderna COVID-19 vaccines across all vaccination sites to eligible residents effective immediately.
On March 29th, the FDA authorized a 2nd booster dose of either the Pfizer or Moderna COVID-19 vaccine for older people and certain immunosuppressed individuals.
Following the FDA’s announcement and the CDC’s recommendation statement, Harris County Public Health has adopted the following COVID-19 guidelines.
- Residents 50 years of age and older who are not moderately or severely immunocompromised may receive a Pfizer or Moderna 2nd booster dose at least 4 months after receipt of their first booster dose.
- A 2nd booster dose of the Pfizer COVID-19 vaccine may be administered to certain immunocompromised individuals 12 years of age and older at least 4 months after receipt of a first booster dose.
- A 2nd booster dose of the Moderna COVID-19 vaccine may be administered to certain immunocompromised individuals 18 years of age and older at least 4 months after the first booster dose.
- Additionally, adults 18-49 years of age who are not moderately to severely immunocompromised and received a Johnson & Johnson COVID-19 primary dose and booster dose at least 4 months ago may now receive a 2nd booster dose using mRNA COVID-19 vaccine. (Pfizer or Moderna only)
All COVID-19 vaccines are free to the community and walk-ins are accepted across all county vaccination sites. Residents can register for their COVID-19 vaccine or booster doses by calling 832-927-8787 or visiting HCPH’s vaccine registration page.
HCPH urges all residents to do their part during the COVID-19 pandemic and continue COVID-19 best practices. This includes getting a vaccination and getting tested if you experience symptoms to best protect yourself and others.


