The move comes after the line removed its mask mandate and the need for guests to take an antigen test last month.
The only exception will be for those guests sailing on A-Rosa Alva on the Douro in Portugal, due to regional regulations stipulating all guests over the age of 12 require proof of complete vaccination or recovery from Covid-19 to join a cruise.
Measures such as extended cleaning and disinfection protocols onboard will remain in place.