Learn about COVID-19, the virus that causes it, how it spreads, and its variants.

Health Departments Guidance, tools, and resources for health departments to address COVID-19.

Mar 10, 2025 · COVID-19 is caused by infection with a coronavirus named SARS-CoV-2, and flu is caused by infection with one of the influenza viruses. You cannot tell the difference between flu and …

Mar 10, 2025 · CDC’s Respiratory Virus Guidance provides strategies you can use to help protect yourself and others from health risks caused by COVID-19 and other respiratory viruses.

May 8, 2025 · Testing for COVID-19 can help you decide what to do next, like getting treatment to reduce your risk of severe illness and taking steps to lower your chances of spreading the virus to …

COVID-19 (coronavirus disease 2019) is a disease caused by a virus named SARS-CoV-2. It can be very contagious and spreads quickly.

Sep 5, 2025 · This page provides an overview of COVID-19 data and trends over time. Other COVID-19 related data visualizations (previously on CDC’s COVID Data Tracker) are provided in the resources …

Mar 10, 2025 · COVID-19 testing can help you know if you have COVID-19 so you can decide what to do next, like getting treatment to reduce your risk of severe illness and taking steps to lower your …

Sep 17, 2024 · People with flu and COVID-19 at the same time can have more severe illness than people with either flu or COVID-19 alone. Additionally, some people with COVID-19 may also be …

Jun 11, 2025 · Your risk of severe illness from COVID-19 increases as the number of your underlying medical conditions increases. Some people are at increased risk of getting very sick or dying from …