Norovirus outbreaks onboard

Norovirus (winter vomiting bug) can sweep a crew of 25 in 24-48 hours. Isolation + hygiene response protocols prevent cascade failure.

Norovirus is highly contagious via faecal-oral route + aerosolized vomit particles. Crew mess galleys are the primary transmission vector. Passenger-vessel outbreaks are notorious — but any vessel calling multiple crew-change ports faces recurring risk. Cascade failure (multiple crew simultaneously incapacitated) is the operational risk.

Practical steps

• Isolate index case immediately + assign dedicated cabin/head/mess use.
• Chlorine bleach (1000 ppm) on all surfaces + linens; norovirus resists alcohol hand rubs.
• Hand-washing with soap + water — the only reliably effective control.
• 72-hour work-return restriction for confirmed cases; longer for food handlers + galley staff.
• Master notifies flag + agent + charterer per SMS + charter-party disease-reporting clauses.

When to escalate

• Multiple cases in 24 hours — outbreak declared; TMAS + flag-state medical adviser consultation.
• Any case in a food handler — mandatory isolation + galley deep-clean.
• Severe dehydration risk (elderly crew, comorbidities) — MEDEVAC criteria.

Last verified 3 months ago