Norovirus and Raw Oysters: A Growing Health Concern

Recent warnings from the Food and Drug Administration (FDA) highlight an increasing risk of norovirus contamination in raw oysters, prompting concerns for consumers and the food service industry. Norovirus, a highly contagious virus, can cause significant gastrointestinal illness. This article provides an overview of the current situation, affected products, symptoms, and preventative measures.

Recent Outbreaks and FDA Warnings

The FDA has issued multiple warnings regarding norovirus contamination in oysters harvested from various regions. In February 2026, the FDA reported that several brands of oysters may be contaminated with norovirus . Specifically, oysters harvested in Canada by Stellar Bay Shellfish Ltd. And shipped to Florida and other states were implicated. Brands affected include Kusshi, Chrome Point, Stellar Bay, and Stellar Bay Gold.

Previously, in May 2025, a recall was issued for frozen raw half-shell oysters harvested in South Korea and distributed across the U.S. Due to potential norovirus contamination . The California Department of Public Health discovered the outbreak and notified the FDA on May 15, 2025.

An earlier outbreak in April 2022 linked illnesses to raw oysters distributed in 13 states, originating from British Columbia, Canada . Affected states included California, Colorado, Florida, Hawaii, Illinois, Massachusetts, Minnesota, New Jersey, Nevada, New York, Oregon, Texas, and Washington.

What is Norovirus?

Norovirus is a highly contagious virus that causes gastroenteritis, commonly known as the “stomach flu.” It spreads easily through contaminated food, water, and surfaces, as well as through close contact with infected individuals. Symptoms typically develop 12 to 48 hours after exposure.

Symptoms of Norovirus Infection

Common symptoms of norovirus infection include:

• Diarrhea
• Vomiting
• Nausea
• Stomach pain
• Fever
• Headache
• Body ache

Most people recover within one to three days, but the illness can be more severe in young children, the elderly, and individuals with weakened immune systems.

Preventative Measures

The FDA strongly advises consumers not to eat raw oysters, particularly those with an unknown origin. Restaurants are urged not to serve them. Because norovirus may not alter the appearance, smell, or taste of contaminated oysters, it’s crucial to exercise caution.

If you have consumed potentially contaminated oysters and are experiencing symptoms, contact your healthcare provider and report your symptoms to your local Health Department.

States Affected by Recent Recalls

Recent recalls and warnings have impacted oysters distributed to the following states:

• Arizona
• California
• Colorado
• Florida
• Georgia
• Idaho
• Kansas
• Nevada
• New York
• Oregon
• Texas
• Utah
• Washington

Key Takeaways

• Norovirus contamination in raw oysters is a recurring public health concern.
• The FDA has issued warnings and recalls for oysters from Canada and South Korea.
• Symptoms of norovirus infection include diarrhea, vomiting, nausea, and stomach pain.
• Consumers should avoid eating raw oysters, especially those of unknown origin.
• If symptoms develop after consuming oysters, seek medical attention.