30 days. about two-thirds of adults in the u.s. have received at least one dose of a vaccine, but certain areas of the country are still fighting. one of the most shocking cases comes from the prison system in texas. 18 people have died from covid after being granted parole. nbc's priscilla thompson has the story. >> this is my son. >> reporter: oscar's mom was overjoyed when in february of 2020 he made parole after serving eight years in prison for a dwi. >> and i was so proud of him. i thought he was going to come home because he wrote a letter to me saying, i'm coming home soon. >> reporter: seven months later he died from covid-19 while working to complete an alcohol education program. he was just shy of his 61st birthday. >> i knew he had to do the programs, but i didn't expect these programs to be six months or almost a full year. >> reporter: according to a new report by researchers at the