Note that in the pilot study, we included a question that resolved in 2017 ("The Zika virus is likely to continue to affect the Western Hemisphere through 2017."). We later decided it was not sensible to assign a probability to something that had already happened, so for the main data collection, we switched this to a different question:"The continued rise of antimicrobial resistance—the ability of pathogens, including viruses, fungi, and bacteria, to resist drug treatment—is likely to outpace development of new antimicrobial drugs." We excluded the pilot data from the Zika question from our analyses.