Cases of chickenpox — a childhood infection that was once nearly universal — have fallen 57% to 90% in communities across the USA since a vaccine was introduced in 1995, a new report shows. Before the vaccine, 4 million Americans a year came down with chickenpox, nearly 11,000 were hospitalized and more than 140 died, according to a report from the Centers for Disease Control and Prevention in today's Pediatrics.

Full story: usatoday.com