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.
Guide to Extinction This was their last album before the band's breakup. After leaving Invisible Records, Nocturne signed again with Triple X Records and began producing their third studio album. The album's themes deal with break-up and relationship, hinting at the 8 year-long relationship between lead singer Lacey Conner and Telkes, which ended shortly after beginning production for "Guide to Extinction". The album's opening song is "Shallow", written by Telkes, in which Conner's lyrics change harshly between screaming and emoting flirtatiously. The lead single "I Lie" was written by Conner, and its lyrics refer to relationships that go awry. The song is a