Serrana is a municipality in the state of São Paulo in Brazil. The population is 45,644 in an area of 126 km². The elevation is 427 m. The municip…Serrana is a municipality in the state of São Paulo in Brazil. The population is 45,644 in an area of 126 km². The elevation is 427 m. The municipality was created by state law in 1948. While other communities were struggling to deal with the COVID-19 pandemic in Brazil, Serrana participated in a study wherein 100% of its adult population was supposed to be vaccinated with CoronaVac. Prior to the mass vaccination, 5% of Serrana's population had been infected, one of the highest rates in Brazil.