Top 5 Takeaways Decline and Resurgence: The incidence of norovirus outbreaks in the United States significantly declined in April 2020, likely due to COVID-19 nonpharmaceutical interventions. However, outbreaks increased rapidly

Top 5 Takeaways Largest Recorded Outbreak: This was the largest documented outbreak of acute gastroenteritis in the Grand Canyon National Park’s backcountry, affecting at least 222 rafters and backpackers, likely