This research compares the performance of bottom-up, self-motivated behavioral interventions with top-down interventions targeted at controlling an ‘‘Influenza-like-illness’’. Both types of interventions use a variant of the ring strategy. In the first case, when the fraction of a person’s direct contacts who are diagnosed exceeds a threshold, that person decides to seek prophylaxis, e.g. vaccine or antivirals; in the second case, we consider two intervention protocols, denoted Block and School: when a fraction of people who are diagnosed in a Census Block exceeds the threshold, prophylax the entire Block. Results show that the bottom-up strategy outperforms the top-down strategies under our parameter settings. Even in situations where the Block strategy reduces the overall attack rate well, it incurs a much higher cost. These findings lend credence to the notion that if people used antivirals effectively, making them available quickly on demand to private citizens could be a very effective way to control an outbreak.
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