Updated Recommendations from the Advisory Committee on Immunization Practices for Use of the Janssen (Johnson & Johnson) COVID-19 Vaccine After Reports of Thrombosis with Thrombocytopenia Syndrome Among Vaccine Recipients - United States, April 2021. - MacNeil, Jessica R.; Su, John R.; Broder, Karen R.; Guh, Alice Y.; Gargano, Julia W.; Wallace, Megan; Hadler, Stephen C.; Scobie, Heather M.; Blain, Amy E.; Moulia, Danielle; Daley, Matthew F.; McNally, Veronica V.; et al. (MMWR: Morbidity & Mortality Weekly Report, 2021)