Where I live, they have NEA contractors, wearing green T shirts with the NEA logo on bicycles ( not Brompton) checking the area, EVERYDAY . Every now & then, you have the NEA in their white T's with NEA logo, checking & going from door to door. YET, we have dengue outbreak...!! this is not opposition ward....we have mixed housing in the area, condos, Public Housing, Landed Properties, Schools etc...
Not enough checking??? or too many mosquitoes?? what do you think, cause the spread of the disease?? despite all the intense checking, checking....60%, who get in people, who have no spurs in the hide, when they work....THEY ARE JUST DOING THE JOB.