Norovirus Management Guidelines

Immediate Clinical Management

The Centers for Disease Control and Prevention recommends oral rehydration therapy as the cornerstone of norovirus management, with aggressive fluid replacement to prevent dehydration being the primary treatment goal, as norovirus gastroenteritis is self-limited and requires no specific antiviral therapy 1, 2
For immunocompetent adults with nonbloody diarrhea, antimotility agents may be used as part of self-treatment, according to the Infectious Diseases Society of America 1

The Centers for Disease Control and Prevention recommends isolating ill patients until 24-48 hours after complete symptom resolution in institutional settings, including hospitals, long-term care facilities, and cruise ships 2, 3
Exclude ill healthcare workers, food handlers, and childcare workers from work until 48-72 hours after symptom resolution, as recommended by the Centers for Disease Control and Prevention 2, 3
Promote frequent handwashing with soap and running water for a minimum of 20 seconds, as this is the most effective method to reduce norovirus contamination, according to the Centers for Disease Control and Prevention 2, 3

The Infectious Diseases Society of America recommends obtaining stool specimens during the acute phase for RT-qPCR diagnosis in immunocompromised patients, as this is the most reliable diagnostic method 3
Evaluate for other opportunistic pathogens, including Cryptosporidium, Cyclospora, microsporidia, Cystoisospora belli, CMV, and MAC, particularly in HIV-infected patients, according to the Infectious Diseases Society of America 1, 3

Symptoms begin 12-48 hours after exposure with acute onset, and in immunocompetent individuals, symptoms typically last 12-72 hours with self-resolution, according to the Centers for Disease Control and Prevention 4
Peak viral shedding occurs 2-5 days after infection, and viral shedding can continue for an average of 4 weeks following infection, though infectivity beyond the acute phase is unclear, as reported by the Centers for Disease Control and Prevention 5, 4

Initiate investigations promptly, collecting clinical and epidemiologic information to identify the predominant transmission mode and possible source, as recommended by the Centers for Disease Control and Prevention 2
Collect whole stool specimens from at least five persons during the acute phase for RT-qPCR diagnosis, perform genotyping, and report results to the CDC via CaliciNet, according to the Centers for Disease Control and Prevention 2

The Centers for Disease Control and Prevention, as reported by MMWR Recommendations and Reports, states that norovirus infections typically last 1 to 3 days in healthy individuals, although longer courses of 4 to 6 days can occur in young children, the elderly, and hospitalized patients 6
The Infectious Diseases Society of America (IDSA) classifies diarrhea lasting 7-13 days as "prolonged" 7, 8

The IDSA guidelines suggest that vomiting or diarrhea persisting for more than one week is atypical and requires immediate evaluation for alternative diagnoses 7, 8
It is essential not to assume that all cases resolve within 1-3 days, as the elderly, young children, and hospitalized patients frequently have more prolonged courses 6