If you think about the bird flu epidemic of a couple of years ago, the more people that were infected, the more people that got infected, and the faster the virus spread before the authorities managed to get a handle on events.
Pensando na epidemia de gripe aviária de alguns anos atrás, quanto mais gente infectada, mais gente era infectada, e mais rápido o vírus se espalhava antes que o conseguissem controlar.