DCHHS Immunization Clinics First, second and booster doses are available for adults. First and second doses available for children 5+ with parental consent. Hours of operation Monday through Friday 8:30 a.m. to 3:30 p.m. Vaccinations by appointment only call 972-692-2780. Vaccination locations can be found listed in English and Spanish at covid-19-vaccination.php Testing locations differ in their hours of operation. Whether appointments are required or are optional. And if they have drive thru availability. For COVID 19 testing locations go to www.dallascounty.org/covid-19/testing-locations.php