About NorovirusQuestions.com

Independent, evidence-based information about norovirus for people who want straight answers from primary sources.

Our Mission

NorovirusQuestions.com was built to provide clear, sourced, and accurate information about norovirus — the leading cause of acute gastroenteritis worldwide, causing an estimated 685 million illnesses and roughly 50,000 child deaths a year, mostly in developing countries, per the CDC's Facts and Stats page. In the United States it causes an estimated 19–21 million illnesses, 109,000 hospitalizations, and about 900 deaths a year (CDC).

Despite its global burden, norovirus is often dismissed as a minor inconvenience. For healthy adults it usually is. But for the elderly, immunocompromised, and young children — and for settings like cruise ships, hospitals, and long-term care facilities where transmission is rapid — the stakes are much higher. This site exists to provide what the evidence actually shows, for readers who want more than "wash your hands."

All content is written for a general audience and is not a substitute for professional medical advice. In an emergency, call 911.

What This Site Adds Beyond CDC

The CDC's norovirus pages are the first thing we link to, and if all you need is "wash your hands and stay home for 48 hours," they answer it. This site exists for the next layer of questions, which the CDC's consumer pages do not address:

  • Where the numbers come from. Every US burden figure on CDC's site is a modeled estimate. We name the study behind each one (Hall 2013; Burke 2021), give its confidence interval, and explain why norovirus is not counted case by case.
  • What the current season looks like. CDC's CaliciNet and NoroSTAT systems publish monthly genotype and outbreak counts that its consumer pages do not summarize. Our Outbreaks page does — including the 2024–2025 GII.17 season that broke a twelve-year pattern.
  • Where the evidence disagrees. Two peer-reviewed challenge studies put the infectious dose at roughly 18 and roughly 1,300 particles. We publish both, with DOIs, and explain the gap (Transmission).
  • What the law actually says. The FDA Food Code's exclusion and reinstatement rules for a food worker diagnosed with norovirus, quoted by section, not paraphrased (Food Safety).
  • What is not known. No hospitalization rate, no case-fatality rate, no per-route breakdown of transmission — each stated as a blank with its reason, on the Risk Perspective page and wherever it is relevant.
  • Compared to what. Norovirus is the highest-incidence and among the lowest-lethality viruses in the network's dataset; the hub's Virus Risk Perspective puts it beside 14 others on the same five measures.

Who Writes This Site

All content is researched and written by Andy Wilcox, founder of the Virus Questions network. Andy is an independent researcher with 30+ years of analytical experience — not a physician, virologist, or epidemiologist.

His approach: work directly from CDC, WHO, NIH, and peer-reviewed primary sources rather than secondary summaries. Claims are checked against current authoritative guidance monthly via an automated review process.

This site has no medical reviewer. No content on this site is reviewed by any licensed clinician. For personal medical concerns, consult a qualified healthcare provider.

Source Standards

We use a hierarchy of evidence consistent with evidence-based medicine:

  1. Peer-reviewed studies — systematic reviews, RCTs, and observational research in indexed journals
  2. CDC, WHO, and NIH guidance — primary public health authority documents
  3. FDA and food safety authority guidance — for food-handling and outbreak context

We do not cite press releases, social media posts, or news articles as primary evidence for clinical claims.

Monthly Review Process

Every clinical page undergoes an automated monthly review that checks current CDC and WHO guidance against existing page content. Claims directly contradicted by updated authority guidance are corrected. The "Last reviewed" date on each page reflects the most recent review.

Affiliate & Advertising Disclosure

Amazon Associates: NorovirusQuestions.com is enrolled in the Amazon Services LLC Associates Program. As of September 2026 no affiliate link appears on any indexable page of this site — affiliate content is switched off network-wide behind a single flag and has stayed off. If it returns, product selections will be editorial rather than commission-driven, every affiliate link will carry a disclosure beside it, and this paragraph will be updated the day it changes.

Google AdSense: As of September 2026 this site displays no advertising. The site remains registered with Google AdSense and ads could be re-enabled; if that happens, this paragraph will say so on the day it changes. Any ads served would be selected by Google's algorithms, not by this site, and would not be editorial endorsements.

Medical Disclaimer

The information on NorovirusQuestions.com is for general informational and educational purposes only. It is not intended as, and does not constitute, medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider for any medical concerns. In an emergency, call 911.

Contact & Corrections

For corrections, errors, or feedback, use the Contact page or the Corrections page. We read all submissions and prioritize factual corrections. Confirmed corrections are applied promptly and the change is noted on the affected page — and reported errors that turn out not to be errors are logged too, as rejected, so the record shows what was checked and not only what was changed. The corrections page lists every entry for this site, including the September 2026 replacement of an unsourced "65%" outbreak-setting figure with CDC's actual wording, and the August 2026 145°F report that was investigated and upheld.

The Virus Questions Network

NorovirusQuestions.com is part of the Virus Questions network, a collection of independent, disease-specific reference sites covering major viral pathogens. All sites follow the same editorial standards, source hierarchy, and monthly review process. Other sites in the network: