Unlike most European countries, Sweden opted for the 'herd immunity' strategy to battle the novel coronavirus COVID-19 pandemic. In April, Swedish state epidemiologist Anders Tegnell predicted that by the end of May, 40% of the population would develop antibodies to fight the virus. Sweden didn't impose a strict lockdown. Instead, it kept schools, restaurants and bars open. Instead, it merely asked Swedes to be careful and to enact voluntary social distancing.