Social & Preventive Medicine Infectious Disease Epidemiology d27a381e All of the following are true for yellow fever EXCEPT A Caused by vector aedes B Incubation period of 3-6 days C One attack gives life long immunity D Validity of vaccination certification begins immediately after vaccination High-Yield Explanation Ans. (d) Validity of vaccination certification begins immediately after vaccinationRef : K. Park 23rd ed. /121, 283