To prevent the spread of yellow fever across borders, the area surrounding airpos and seapos should be free from breeding of aedes mosquito. What is the area to be kept free of aedes mosquito/insect vector?

As per the guidelines an area extending at least 400 m around an airpo/sea po must be kept free from the breeding of insect vector. Also know: Aedes aegypti index - is the % of houses and their premises in a well defined area, showing actual breeding of aedes aegypti larvae. It should not be more than 1% in towns and seapos in endemic areas to ensure freedom from yellow fever. Ref: Park, Edition 21, Page - 259.