coronavirus June 30, 2020 5:39 pm Researchers Say This Type of Cloth Mask Is the Most Effective News4’s Doreen Gentzler has the latest research on which type of cloth mask is the best at preventing the spread of COVID-19. Local 4:45 Seeking a sickle cell cure: 12-year-old in DC is 1st patient to get new gene therapy 4:53 Here's what to check before any cosmetic procedure 1:56 Primary care clinics open in DC housing complexes 2:27 Vitamin K shots for newborns: A doctor debunks myths and explains why the shots are essential 2:09 DC clinic offers mental health support for children