Which viral agent is a common cause of gastroenteritis?

Norovirus is recognized as a leading cause of gastroenteritis, which is characterized by inflammation of the stomach and intestines resulting in symptoms such as diarrhea, vomiting, and abdominal pain. This virus is highly contagious and can spread through contaminated food and water, as well as person-to-person contact. Norovirus outbreaks are frequently associated with settings such as cruise ships, schools, and nursing homes.

The other choices represent viral agents that do not primarily cause gastroenteritis. Rhinovirus is primarily associated with upper respiratory tract infections, particularly the common cold. The influenza virus is also primarily linked to respiratory illnesses rather than gastrointestinal symptoms, though some individuals may experience nausea or diarrhea. HIV primarily affects the immune system and is not associated with gastroenteritis as a direct cause, though it can lead to gastrointestinal complications in advanced stages of the disease. Therefore, norovirus is specifically linked to outbreaks of gastroenteritis, making it the correct answer.