Social & Preventive Medicine All are true about Yellow Fever except A Incubation period is 3-6 days B Validity of Int’l certificate of Vaccination lasts up to 10 years C Urban form is controlled by 17 D vaccine D Aedes aegypti index should not be more than 10% to ensure freedom from yellow Fever 💡 Explanation All are true about Yellow Fever except ✓ Correct Answer: D. Aedes aegypti index should not be more than 10% to ensure freedom from yellow Fever