Norovirus

Clear→ stable

Gastrointestinal

Current NYS Status

Wastewater signal at seasonal baseline. No current outbreaks reported. Norovirus peaks November through April.

Source: NYSDOH wastewater surveillance

What is it?

Norovirus is a highly contagious virus that causes vomiting and diarrhea. It is the leading cause of foodborne illness outbreaks in the United States and peaks in winter months.

How it spreads

Spreads through contaminated food or water, direct contact with an infected person, or touching contaminated surfaces then touching your mouth. Just a small number of viral particles can cause infection.

Symptoms

Nausea, vomiting, diarrhea, and stomach cramps that start suddenly. Symptoms typically last 1–3 days. Low-grade fever, headache, and body aches are common.

Who is at risk?

Everyone is susceptible. Young children, older adults, and immunocompromised individuals are at highest risk for serious dehydration.

What you can do

🛡Wash hands with soap and water (hand sanitizer is not as effective against norovirus)

🛡Stay home from work or school for at least 48 hours after symptoms resolve

🛡Disinfect contaminated surfaces with a bleach-based cleaner

⚕️Stay hydrated — dehydration is the main complication

Tier A — Real-time tracking

Surveillance data updated from government sources daily or weekly. Threat level reflects current wastewater signal or clinical reports.

Seasonality: winter

This information is for general public health awareness and is not a substitute for professional medical advice, diagnosis, or treatment.