If you have already received your first dose of the COVID-19 vaccine, you can register for the Center of Disease Control (CDC) v-safeSM After Vaccination Health Checker. Using your smartphone, you can easily report side effects and even get reminders if you need a second vaccine dose. Remember, getting the vaccine doesn’t replace taking the necessary precautions such as wearing a mask, hand washing, and social distancing. For a full list of COVID-19 safety requirements, visit the CDC's vaccine information page. vaccine