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. 2023 Apr;29(4):734–741. doi: 10.3201/eid2904.221433

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Emerging Infectious Diseases is a publication of the U.S. Government. This publication is in the public domain and is therefore without copyright. All text from this work may be reprinted freely. Use of these materials should be properly cited.

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Day of first symptoms for COVID-19‒conditions as part of extensive spread of SARS-CoV-2 Delta variant among vaccinated persons during 7-day river cruise, the Netherlands. Infections were later confirmed by using reverse transcription PCR. The day for first symptoms is unknown for 3 crew members. The cruise ended on day 7.