Gov. Greg Abbott said Tuesday that "a significant portion" of the more than 600,000 coronavirus vaccines delivered to health care providers in the state "might be sitting on hospital shelves" rather than being administered to Texans. Saying "no vaccine should be kept in reserve," the state's chief health official ordered providers Tuesday to begin offering vaccinations to people over 65 and those with medical conditions, including pregnancy, that put them at greater risk of a severe case of COVID-19. Dr. John Hellerstedt, commissioner of the Texas Department of State Health Services, said in a letter last week to providers that he had become aware of "unnecessary delays in administering all allocated vaccines," urging them to "act with all deliberate speed."