• Kestrel

    After reading the CDC prevention page, I am curious about how norovirus gets into/onto shellfish. Will you please explain? And after getting norovirus last year when visiting grandchildren (who had had it the week before we arrived) I now know what the term “violently ill” means.

    • Liz B

      Hello Kestrel, I hope this answer helps!

      We think oysters become contaminated with norovirus as they filter water to eat, if that water is contaminated with the virus. We know that some enteric viruses like norovirus can actually become concentrated in the digestive tracts of these animals as they feed. Since noroviruses and other unwanted microbes can be in contaminated water, a lot of care is taken with water quality at shellfish production areas to prevent these animals from coming into contact with these pathogens.