The CDC has issued warnings for cruise ship passengers regarding a heightened risk of gastrointestinal illnesses, noting 16 outbreaks in 2025, with 10 due to norovirus. The emergence of a new strain, GII.17, is linked to the increase in illness. In comparison, recent years saw fewer outbreaks (18 in 2024, 14 in 2023). Norovirus is prevalent from November to April and spreads easily in crowded environments. Passengers should be vigilant and report any illness to help mitigate outbreaks aboard cruise ships.
In the 2024-2025 season, a new strain of norovirus (GII.17) became predominant, leading to increased reports of illness as seen in the cruise industry.
Norovirus outbreaks can happen anywhere and can spread quickly, particularly in enclosed or crowded environments such as cruise ships.
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