Shelby Tauber for The Texas Tribune Susan Valadez looks at a Texas Department of State Health Services advertisement encouraging people to get the COVID-19 vaccine before she enters a Walmart in Fort Worth on April 30. At its peak, the mass COVID-19 vaccination site at the Kelly Reeves Athletic Complex in Williamson County was administering about 4,000 doses per day. Now it’s half that. County health officials will close the North Austin drive-thru hub in mid-May, shifting the responsibility to a growing number of doctors, pharmacies, public health offices and other smaller providers who have closer relationships with and easier access to the county’s estimated 200,000 eligible residents who haven’t yet gotten vaccinated.