If you’ve had norovirus already this season, you might think you’re safe from getting it again.
However, health experts warn that two different strains of norovirus are spreading at the same time, meaning you could catch it twice.
What is Norovirus?
Norovirus is a highly contagious stomach bug that spreads easily through direct contact with an infected person, touching contaminated surfaces, or eating food prepared by someone with the virus.
It causes symptoms like vomiting, diarrhea, and stomach pain.
Why Are Cases Rising?
According to new data from the UK Health Security Agency (UKHSA), norovirus cases in early February 2025 were more than double the five-season average.
This is the highest number recorded since UKHSA began detailed tracking. The virus is spreading rapidly, especially in hospitals and care homes, with older adults being most affected.
Dr. Damien Tully, an expert in infectious diseases, explains that two different norovirus strains are circulating this season: the usual GII.4 strain and a newer GII.17 strain. The GII.17 variant has been around for years but has only recently started spreading more widely. Since most people have little to no immunity to this new strain, infections have surged.
Can You Get Norovirus Twice?
Yes, it’s possible to catch norovirus more than once this season. Having one strain doesn’t protect you from the other. Dr. Tully says that the long-dominant GII.4 strain is still spreading, and the new GII.17 variant is evolving quickly. It’s uncertain whether GII.17 will become the new dominant strain, but researchers are studying its rapid changes to understand why it’s spreading so effectively.
How to Protect Yourself
Norovirus is extremely infectious, but there are ways to reduce your risk:
- Wash your hands properly. Use soap and warm water—alcohol-based hand sanitizers do not kill norovirus.
- Clean surfaces regularly. Norovirus can survive on surfaces for days, so use bleach or disinfectant to clean areas that may be contaminated.
- Be cautious with food. Avoid eating raw or undercooked shellfish, like oysters, as they can carry norovirus. Wash fruits and vegetables thoroughly before eating.
- Stay home if you’re sick. Norovirus spreads quickly, so if you have symptoms, avoid contact with others, especially vulnerable people like the elderly.
While norovirus is usually just an unpleasant illness, it can be serious for older adults and healthcare workers. Taking simple steps to prevent its spread can help protect both yourself and others.
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Source: KSR.
