Lindblad Expeditions became the third cruise line this week to say that staring March 1, guests eligible for the Covid booster will be required to have one prior to embarkation.
Silversea and Azamara earlier this week became the latest cruise lines to require passengers to get a Covid-19 booster shot if they are eligible for one.
Starting with cruises departing March 1, both brands are requiring a Covid-19 booster.
Earlier this month, UnCruise Adventures said it would require boosters for eligible guests starting Feb. 5, and German luxe brand Hapag-Lloyd Cruises beginning Feb. 14.
Both Hapag-Lloyd and Silversea are owned by Royal Caribbean Group. Most lines, including Royal Caribbean International and Carnival Cruise Line, "strongly recommend" that passengers get boosters but do not require it.
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This report was updated on Jan. 27 to add that Lindblad Expeditions will require guests to get the Covid-19 booster shot.