Third doses of the fully-approved Pfizer vaccine as well as the Moderna vaccine which is still under emergency use authorization – or coronavirus booster shots – are being administered in Memorial Hermann Health System hospitals and clinics throughout Greater Houston to immunocompromised individuals as judged by criteria from the Centers for Disease Control and Prevention (CDC), according to an Aug. 24 news release from the hospital system.

And though there are no walk-in clinics offering the booster within Fort Bend County limits, there are multiple clinics within moderate driving distance for area residents. For those in the Sugar Land/Stafford/Missouri City/Meadows Place area, the walk-in clinic at Memorial Hermann Southwest (7600 Beechnut St.) is the closest, just a few miles outside the county limits. Memorial Hermann Katy Hospital, 23900 Katy Freeway, is the closest for residents of Richmond, Fulshear, Simonton and those on the northern edge of the county.

Those wanting to get the booster shot can go at any time during walk-in hours for both clinics, which are Monday through Friday from 7:30-10:30 a.m. and 12:30-4:30 p.m.

People who qualify as moderately to severely immunocompromised individuals include:

  • Those receiving active cancer treatment for tumors or cancers of the blood.
  • Organ transplant recipients and those who are taking medicine to suppress the immune system.
  • Those who have received a stem cell transplant within the last two years or are taking medicine to suppress the immune system.
  • Moderate or severe primary immunodeficiency (such as DiGeorge syndrome, Wiskott-Aldrich syndrome).
  • Those with advanced or untreated HIV infection.
  • Those undergoing active treatment with high-dose corticosteroids or other drugs that may suppress their immune response.

Those receiving the booster should be prepared to show their COVID-19 vaccination cards, according to the release. Appointments to get the booster can be made online at, but it can also be received without an appointment.

Beginning the week of Sept. 20, the hospital system said the booster will start being administered to the general public, per recommendations from the CDC.

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