SAN ANTONIO, TX – MARCH 29: A nurse fills up a syringe with the Moderna COVID-19 vaccine at a vaccination site at a senior center on March 29, 2021 in San Antonio, Texas. Texas has opened up all vaccination eligibility to all adults starting today. Texas has had a slower roll out than some states and with the increase in eligibility leaders are hoping more and more citizens get vaccinated. (Photo by Sergio Flores/Getty Images)