HAYS COUNTY, Texas (KXAN) — Registration for nearly 2,000 COVID-19 vaccine doses filled in 15 minutes after Hays County launched an online portal Friday afternoon to book appointments.

Hays County Judge Ruben Becerra apologized in a Facebook post for the appointments filling up so quickly.

Becerra shared the county received 1,950 doses of the Pfizer vaccine, its first shipment since the state designated it as a large-scale vaccination hub.

People could register for an appointment online through HaysInformed.com. County leaders noted every person who would like to get a shot will have to sign up individually.

Those only without internet access are asked to call (512) 938-1650 to register and book an appointment.

Becerra said these initial doses arrived “frozen solid,” so vaccinations are set to begin Monday. That will give more time for the doses to thaw, he added.

County leaders reminded residents that only those who fall within the Phase 1A and 1B categories would be eligible to receive a vaccine at this time.

According to the Texas Department of State Health Services, Phase 1A includes frontline health care workers and residents at long-term care facilities. Those within 1B include people over 65 or with a chronic medical condition that puts them at increased risk for severe illness from COVID-19.

County leaders said when the appointments for this batch of doses are filled, the sign-up portal will close. However, they’ll reopen it when they receive the next batch of doses. It’s unknown at this time how many doses will arrive in future shipments.

The census bureau estimates the population of Hays County was 230,191 people as of 2019. In a briefing from Austin Public Health also on Friday, leaders said they were concerned they had not received enough vaccine and that it could take months to vaccinate the estimated 1.2 million people in Travis County.