Or a transfer of crew with 28 days which may have occurred for both recently.
It isn't just a simple transfer, see red category criteria:
Red Ship Criteria
- One or more cases of confirmed COVID-19 or COVID-like Illness within the past 28 days, or
- Ship received ship-to-ship transfers from a ship that had confirmed COVID-19 or COVID-like illness within the 28 days before the transfer occurred, or
- If land-based crew embarked, they were not immediately quarantined for 14 days upon embarking the ship, or
- During the past 28 days, the ship missed one or more weekly submission of the EDC form.