Norovirus, the notorious stomach bug, is already wreaking havoc during the holiday season, with cases on the rise and potential record-breaking numbers, according to the Centers for Disease Control and Prevention (CDC). This highly contagious virus, often referred to as the 'winter vomiting disease', typically peaks between December and March, but this year's data suggests an early surge.
The CDC's recent findings indicate that almost 14% of norovirus tests returned positive during the week ending November 15, a significant increase from the 10% positive rate recorded in the same period last year. This alarming trend is further supported by expert opinions. Donald Schaffner, PhD, from Rutgers University, predicts a challenging year ahead, stating that this year's numbers may rival or surpass last year's record-breaking rates.
Frank Yiannas, MPH, a former deputy commissioner at the U.S. Food and Drug Administration, explains that while norovirus is active year-round, its peak season aligns with the colder months. Last year, December saw a staggering 25% positive test rate, and this November's numbers are already surpassing previous years, indicating a potential worsening situation.
Adding to the complexity, a new norovirus variant, GII.17, has emerged as a significant contributor to the recent surge in infections. This strain, which accounted for only 10% of outbreaks in the 2022-2023 season, now makes up a staggering 75% of outbreaks during the 2024-2025 season. Schaffner highlights the rapid evolution of norovirus, leading to the emergence of new strains that cause disease, particularly affecting individuals who haven't been exposed before and lack immunity.
Understanding the symptoms and transmission methods is crucial for effective prevention and management. Norovirus can cause nausea, vomiting, stomach pain, diarrhea, low-grade fever, muscle pain, and more. Symptoms typically appear within 12 to 48 hours of exposure and may persist for 1 to 3 days. The virus can remain contagious in stool for weeks and even months in individuals with medical conditions.
Transmission occurs through various means, including contaminated food, water, and surfaces. An infected person can spread the virus by touching food with bare hands, with tiny particles of vomit or feces contaminating food preparation areas, or through contaminated water sources. Additionally, recreational or drinking water can become tainted when septic tanks leak into wells, infected individuals vomit or defecate in the water, or wastewater is inadequately treated.
If infected, individuals should focus on managing symptoms by staying hydrated, resting, and consuming soft, bland foods. There is no cure, and the infection must run its course. Seeking medical attention is advised if unable to eat or drink or if symptoms persist beyond three days. To prevent the spread, the CDC recommends avoiding food preparation or handling others until 48 hours after symptom resolution. Regular handwashing, especially after using the toilet, changing diapers, eating, or preparing food, is essential to minimize the risk of transmission.
