Frequently Asked Questions about COVID-19
COVID-19 is a contagious disease caused by the SARS-CoV-2 virus. Most people with COVID-19 have mild symptoms, but some may become severely ill.
Vaccination
Updated October 2025
Sources: American Academy of Pediatrics, American College of Obstetricians and Gynecologists, Infectious Diseases Society of America, Centers for Disease Control and Prevention, Food and Drug Administration
Related Resources
The Dangers of Influenza and COVID-19 in Adults with Chronic Health Conditions
Call to Action on the importance of protecting adults with chronic health conditions against flu during the COVID-19 pandemic (October 2020)
2020 National Survey: Attitudes about Influenza, Pneumococcal Disease, and COVID-19
NFID 2020 National Survey on flu and pneumococcal disease in the context of COVID-19
