Avian flu has been the focus of significant attention since 2004, when there were reports of human infections in Asia from the avian flu H5N1 strain. To prevent the catastrophic mortality of mankind, several governments are stockpiling antivirals and pharmaceutical firms are increasing their...

Many individuals have strong preferences towards COVID-19 vaccines and would like to choose the vaccine they get. This practice, known as “vaccine shopping,” presents unique challenges to timely vaccine rollout: on the one hand, people may not get vaccinated if they are unable to receive...