Numerous Covid-19 test campaigns, like Bora Testar in the Rocinha slum of Rio de Janeiro, Brazil, were financed via crowdfunding last year. Silvia Izquierdo / ANP

Numerous Covid-19 test campaigns, like Bora Testar in the Rocinha slum of Rio de Janeiro, Brazil, were financed via crowdfunding last year. Silvia Izquierdo / ANP