March 04, 2021 20:15 Updated Follow The Pfizer and Moderna vaccine require two doses. The Johnson & Johnson (Janssen) vaccine requires one. Related articles Can you get the Pfizer vaccine for the first dose and the Moderna vaccine for the second dose? I don’t have consistent access to a mobile phone, how can I ensure that I am signed up? How can I ensure that I won’t miss my second shot if I lose access? If I get the first dose and then test positive for COVID-19, do I make an appointment for the second dose, or do I wait 90 days? Do I even need the second dose? How many days should pass between getting the first vaccination and getting the second vaccination for the Pfizer and Moderna vaccines? How do I sign up for an appointment?