RIO DE JANEIRO, BRAZIL - When a young woman joined her family for a barbecue one recent Sunday in southern Brazil, soon after a night on the town, she had no idea she would infect 18 relatives with the new coronavirus, and three of them would eventually die.
Young Brazilians, energized by the arrival of summer and suffering from social distancing fatigue after months of confinement, have taken to the streets and beaches to party in increasing numbers.
Public health experts warn that an accelerated transmission rate among young people has been a major contributor to a surge in coronavirus cases . . .