The Rock Island County Health Department (RICHD) will only have 50 doses of the new Moderna bivalent booster available for its regular Tuesday COVID-19 immunization clinic on September 20.

Doses of Pfizer’s bivalent booster vaccine will be offered when Moderna’s supply this week runs out, the department said in a statement on Monday.

The FDA has cleared the safe and effective use of mixed booster doses based on the results of a research study supported by the National Institute of Allergy and Infectious Diseases. Those who received the first two doses of Moderna (primary series) can receive Moderna or Pfizer as boosters, regardless of which brand was given for the previous booster doses.

A pharmacist injects a patient with a booster dose of the Moderna COVID-19 vaccine at a vaccination clinic in Lawrence, Mass., Wednesday, Dec. 29, 2021. (AP Photo/Charles Krupa, File)

Nationally, demand for the new booster formulated to protect against Omicron subvariants and the original virus strain is exceeding production, according to the RICHD statement.

“We have ordered more Moderna booster doses, but do not know when they will be available for shipment,” department administrator Nita Ludwig said in the statement. “We will notify Quad-City media and post on our social media when additional doses of Moderna become available.”

The Pfizer booster is available to anyone 12 and older, and the Moderna is available to those 18 and older. Eligible people can receive the bivalent booster at least two months after their last dose.

RICHD offers two walk-in clinics per week: Moderna on Tuesdays and Pfizer on Fridays. Hours are 9 a.m. to noon and 1 p.m. to 4 p.m. for both clinics. No appointment is necessary. Those who come to all clinics are asked to bring their vaccination record.

The first and second doses of the Moderna vaccine will also be available at each Tuesday clinic. Pfizer primary series doses are offered every Friday.

In addition to health services across the country, updated reminders are available at pharmacies and other health care providers. The best way to locate a vaccine supplier near you is to click HERE and search for the availability of bivalent boosters.

On September 1, 2022, CDC Director Rochelle P. Walensky, MD, MPH, endorsed the recommendations of the CDC’s Advisory Committee on Immunization Practices for the use of Pfizer-BioNTech’s updated COVID-19 reminders for those aged 12 and over and Moderna for those aged 18 and over.

Updated COVID-19 boosters add advanced Omicron BA.4 and BA.5 protein components to the current vaccine composition, helping to restore protection that has waned since the previous vaccination by targeting variants that are more transmissible and that evade the immune system, according to the CDC.