@Flavia202,
St. Lucia, like many other islands in the Caribbean, maintains a list of "COVID Certified" properties which vaccinated guests may select on their Travel Authorization Application. The contains two classifications for the properties: 1) allowed to host both vaccinated and unvaccinated guests; and 2) allowed to host only vaccinated guests. Vaccinated travelers may also stay with family and friends regardless of the vaccination status of the local household members. The tourism authority will send a verification request to any property selected by an unvaccinated traveler.
Since our guesthouse can accept only vaccinated guests, their status is confirmed by the authorities before they get to our door.
@Anne1546, we just state in our listing details that we cannot accept anyone who requires quarantine.