For the pilot study we propose to recruit 500 individuals with ILI symptoms and apply the QuickVue rapid diagnostic test, so that we can follow-up a maximum of 200 index cases with a positive test result, and their households. We will stop recruiting as soon as we have 200 influenza-positive index cases, and we will stop recruiting after we have used 1,000 rapid diagnostic tests even if we have fewer than 200 influenzapositive index cases. Each household will be randomized to receive one of the three interventions, and all household contacts will be followed up. Details of the power calculation to justify this sample size are given below. Given an average household size of 3.8, a study of 200 households will involve the enrolment of a total of 760 individuals (200 index cases and 560 household contacts).