The changes – which come into effect on 8 August – will see unvaccinated children aged two years and older required to show proof of a negative Covid-19 test taken within three days of embarkation.
Fully vaccinated passengers sailing six nights or longer from US ports will also have to show proof of a negative test taken within three days of embarkation.
Meanwhile, fully vaccinated passengers sailing five nights or less from US ports are recommended to have tested negative for Covid within three days of embarkation, but this is not a stipulation for boarding.