Treatment options for chronic norovirus infection in immunocompromised patients.

Norovirus is generally an acute infection causing symptoms such as diarrhea, nausea, and vomiting lasting for 24-48 hours. However, for immunocompromised patients, norovirus gastroenteritis can last for several years and result in villous atrophy and lead to severe malnutrition, dehydration, electrolyte imbalance and continuous viral shedding. Several treatment strategies have been suggested in case reports: nitazoxanide, ribavirin and enterally administered immunoglobulin with varying results. Favipiravir is also suggested but not tested on humans, highlighting the need for further research.