What are the adverse effects of yellow fever vaccine?
• Adverse reactions following yellow fever vaccine are typically mild and consist of headache, myalgia, low grade fever, and/or soreness at the injection site and will occur in 10–30% of recipients. Injection site reactions tend to occur from days 1–5 after immunization. • Systemic adverse effects also occur early but may last up to 2 weeks. • Rash, urticaria, bronchospasm, and anaphylaxis occur rarely (estimated to be 1 case per 130,000 doses of vaccine). • Post-vaccine encephalitis may occur rarely in infants under 6 months old (0.5 to 4 cases per 1000 infants under 6 months old).
