Coronaviruses are a group of related RNA viruses that cause diseases in mammals and birds. In humans and birds, they cause respiratory tract infections that can range from mild to lethal.

Apr 17, 2026 · Coronavirus disease (COVID-19) is an infectious disease caused by the SARS-CoV-2 virus. Most people infected with the virus will experience mild to moderate respiratory illness and …

Learn about the types of COVID-19 treatments, symptom management, and recovery. Information for healthcare workers about COVID-19. Guidance, tools, and resources for health departments to …

Apr 13, 2026 · BA.3.2, a heavily mutated new COVID-19 variant that may be better able to evade immunity from vaccines or prior infection, is now spreading in the United States. Although COVID …

Mar 13, 2026 · Coronavirus disease 2019 (COVID-19) is an illness caused by the virus SARS-CoV-2. Learn more about the symptoms, risks and ways to protect yourself.

Apr 1, 2026 · The COVID-19 variant BA.3.2, nicknamed "Cicada," has been detected in at least 23 countries and half the states in the U.S.

These dashboards show trends in Washington state for COVID-19, influenza (flu), and respiratory syncytial virus (RSV). The data on these dashboards help us monitor early signs of disease spread, …

COVID-19 is an illness caused by the SARS-CoV-2 virus. It spreads through respiratory droplets.

A new COVID-19 variant is spreading across the US - with some health experts concerned it can evade some vaccines. Nicknamed “Cicada” for its long hibernation and noisy return, the strain is ...

Apr 8, 2026 · While COVID-19 cases are down overall nationwide, the Cicada variant is quickly gaining ground, new data shows.