Pandemic smallpox was responsible for 300–500 million deaths. As recently as the early 1950s, an estimated 50 million cases of smallpox occurred in the world each year. After successful vaccination campaigns throughout the 19th and 20th centuries, the WHO certified the eradication of smallpox in December 1979. To this day, smallpox is the only human infectious disease to have been completely eradicated, and one of two infectious viruses ever to be eradicated. Historically, measles was prevalent throughout the world, as it is highly contagious. According to the U.S. National Immunization Program, 90% of people were infected with measles by age 15.
Countdown to Extinction: Live Countdown to Extinction: Live Countdown to Extinction: Live is a live album by American heavy metal band Megadeth, released on September 24, 2013, through Dave Mustaine's Tradecraft label in Blu-ray, DVD, and CD formats. It was recorded during the band's ""Countdown to Extinction" 20th Anniversary Tour" at a show at Fox Theatre in Pomona, California, on December 7, 2012, and features the band performing the entire "Countdown to Extinction" album. The album debuted at number 119 on the "Billboard" 200. "Countdown to Extinction" was released in 1992, and became the band's most successful record both on the charts (U.S. #2)