Hantavirus pulmonary syndrome outbreak linked to cruise ship travel in April-May 2026.

An Andes virus (ANDV) hantavirus pulmonary syndrome outbreak on a cruise ship in April 2026 involved 10 of 13 cases with genomic data supporting a tightly linked cluster.

• Why it matters: The key concern is how travel can rapidly spread a pathogen already capable of human transmission under certain conditions, complicating detection and response across borders.
• What they did: During a cross-country investigation, investigators shared initial raw data for joint analysis with reciprocal quality control and generated ANDV genome sequences for 10/13 identified cases.
• The result: Genomic sequences, symptom onset timing, and plausible contact patterns strongly support a single or very few zoonotic spillover events before embarkment followed by human-to-human transmission onboard, without evidence of an unusual viral strain.

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