Trending Diseases - December 2025

A highly contagious respiratory illness caused by influenza viruses. The 2025-2026 season features a severe H3N2 variant causing widespread illness.

📊 H3N2 subclade K "super flu" - highest doctor visits since 2005

A common respiratory virus causing cold-like symptoms, particularly concerning in infants and elderly.

📊 Especially affecting infants and elderly - tripledemic pattern

A respiratory illness caused by the SARS-CoV-2 virus with symptoms ranging from mild to severe.

📊 Seasonal winter surge continuing

A highly contagious virus causing sudden vomiting and diarrhea. Often called "stomach flu" or "winter vomiting bug," norovirus outbreaks surge in winter months.

📊 Winter vomiting bug outbreaks increasing

A viral infection of the upper respiratory tract causing runny nose, sore throat, and congestion. Usually mild and self-limiting, resolving in 7-10 days.

📊 Peak cold season - over 200 virus strains circulating

A highly contagious bacterial infection causing severe coughing fits with a characteristic "whooping" sound. Cases are increasing in 2025 due to waning vaccine immunity.

📊 Highest cases in a decade - waning vaccine immunity

Inflammation of the bronchial tubes causing cough with mucus, chest discomfort, and fatigue.

📊 Often follows flu/cold infections

A serious lung infection that fills air sacs with fluid, causing cough, fever, and difficulty breathing. Can be caused by bacteria, viruses, or fungi.

📊 Complication of flu, RSV, and COVID-19

A bacterial infection causing severe sore throat and fever. Unlike viral sore throats, strep throat requires antibiotic treatment to prevent complications.

📊 Elevated in school-age children

Pain, scratchiness, or irritation of the throat that often worsens when swallowing.

📊 Top symptom searched this season