After updating the vaccine policies, Cunard and P&O have become the first cruise lines requiring mandatory vaccines against COVID-19 plus protection with booster shots, after the fast spreading of the omicron variant throughout the globe. All booked passengers intending to embark the Queen Mary 2 on 14th of January, were informed in a letter about the latest updates: "In order to travel on your voyage, all guests must be fully vaccinated with a booster vaccination at least seven days prior to tra