The Pfizer vaccine arrived at Methodist Dallas Medical Center early Monday morning. The first doses of a COVID-19 vaccine began arriving arriving throughout the U.S. on Monday including in Texas, with health care workers first in line to receive the shots. The Texas Department of State Health Services said 19,500 doses of the vaccine were headed Monday to four sites in Texas: MD Anderson Cancer Center in Houston, Methodist Dallas Medical Center, Wellness 360 at UT Health San Antonio and UT Health Austin's Dell Medical School. Young's encouraging people to continue wearing masks and social distancing while herd immunity is built up so that hospitals are not overwhelmed.