A contagious new COVID-19 variant called NB.1.8.1, aka "Nimbus," is now dominant in the United States, CDC data show. What to know about symptoms and vaccines.

Mortality and economic contraction during the 1918-1920 Great Influenza Pandemic provide plausible upper bounds for outcomes under the coronavirus (COVID-19). Data for 48 countries imply flu-related ...

Flu symptoms combined with confusion could signal serious conditions like meningitis or sepsis. Learn 7 warning signs that need emergency care.

Key Takeaways The stomach flu causes uncomfortable digestive symptoms like diarrhea and vomiting, and can lead to dehydration. Staying hydrated with clear liquids and electrolyte-rich drinks is ...