General Medicine General d83af158 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? A At Least 200m around the sea/airpos B At Least 300m around the sea/airpos C At Least 400m around the sea/airpos D At Least 500m around the sea/airpos