Prime Minister Ralph Gonsalves said in a press conference that people have to be vaccinated if they go aboard a cruise ship or are granted temporary refuge in another island. He said two Royal Caribbean cruise ships are expected to arrive by Friday and a third one in the coming days, as well as two Carnival cruise ships by Friday. Islands that have said they would accept evacuees include St. Lucia, Grenada, Barbados and Antigua.

From this article https://abc7.com/volcano-in-st-vincent-erupts-as-thousands-evacuate-/10501485/