Which vaccine is indicated for travel to yellow fever–endemic regions and relevant to aircrew?

• A. Hepatitis A vaccine
• B. Meningococcal vaccine
• C. Yellow fever vaccine
• D. Rabies vaccine

Answer: (C)

Vaccination against yellow fever is the protection travelers need when going to regions where yellow fever occurs, and it’s especially important for aircrew because many destinations require proof of immunization for entry. The yellow fever vaccine is given as a single dose and produces immunity that typically starts about 10 days after vaccination, with long-lasting protection. Many countries require an International Certificate of Vaccination to verify this protection, which is why aircrew often carry this credential. The other vaccines protect against different diseases (hepatitis A, meningococcal disease, rabies) and do not prevent yellow fever, so they don’t meet the travel need specific to yellow fever-endemic regions.