The CDC said that people with underlying medical conditions are at an increased risk of "severe illness" from the coronavirus and can get the COVID-19 vaccine as long as they "have not had a severe allergic reaction to any of the ingredients in the vaccine." … The CDC warned that information for the safety of the vaccine for those with HIV and weakened immune systems isn't available yet and while people living with HIV were included in clinical trials of the vaccine, data for that group isn't available either.