“The CDC says that cruise ships must have at least 95 percent of passengers and 98 percent of crew members vaccinated against COVID-19. However, no cruise ship has to ensure that passengers are vaccinated against: Chickenpox Cholera Diphtheria Flu Hepatitis A Hepatitis B HPV Measles Meningococcal Mumps Pneumococcal Polio Rotavirus Rubella Shingles Smallpox Tetanus Tuberculosis Typhoid Fever Yellow Fever”
Source: COVID-19 Must Be the Deadliest Disease Known to Man – LRC Blog