In July 2018, the Maine Center for Disease Control and Prevention investigated an outbreak of norovirus among persons who swam at Woods Pond Beach in Bridgton, Maine. The agency used social media to identify persons who visited the pond during July 1-6, interviewed 34 heads of household, and completed surveys for 148 household members. Ninety-seven people reported illness. Two specimens collected from ill persons tested positive for norovirus, genogroup I. One person was hospitalized. No one died.

Visitors who reported swallowing pond water or going under water (a potential marker for swallowing water) were approximately three times more likely to be ill than were those who did not (relative risk = 3.19; 95% confidence interval [CI] = 1.69–6.05). The source of water
contamination was undetermined.