To date, the most reliable and effective tool for a correct diagnosis of Covid-19 is the nasopharyngeal swab (antigen test), a painless and fast test. The test consists of using a cotton swab to take a biological sample from the upper respiratory tract (nose and pharynx) and submitting it for analysis. Test results will be available within approximately 1 hour: you will not be allowed to board the ship until you have received a negative test result. The costs of the test will be borne entirely by Costa. Further verification with a second swab (RT-PCR molecular test) may be necessary