What is a major cause of diarrhea in infants during the winter in the United States?

Rotavirus is a major cause of diarrhea in infants during the winter months in the United States, primarily due to its prevalence and high transmissibility in younger populations. This virus infects the intestines and is well-known for causing gastroenteritis, particularly in infants and young children. The peak season for rotavirus infections aligns with the winter months, making it a significant concern during this time.

The mechanism of infection involves the virus being transmitted through the fecal-oral route, often through contaminated hands, surfaces, or food. Rotavirus is capable of causing severe diarrhea, vomiting, and dehydration, which can be particularly dangerous for infants.

While other pathogens such as norovirus, which is another common cause of viral gastroenteritis, or bacteria like Salmonella and E. coli could also cause diarrhea, they do not have the same level of impact in infants during the winter season as rotavirus does. Rotavirus infections typically lead to more hospitalizations in this demographic, further emphasizing its prominence as a causative agent of diarrhea among young children during the winter months.