Capturing COVID-19–Like Symptoms at Scale Using Banner Ads on an Online News Platform: Pilot Survey Study
BackgroundIdentifying new COVID-19 cases is challenging.Genotyping of polymorphic effectors of Toxoplasma gondii isolates from China.Not every suspected case undergoes testing, because testing kits and other equipment are limited in many parts of the world.Yet populations increasingly use the internet to manage both home and work life during the pa