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.
How to Be a Human Being video. The foursome toured Australia for their second time, before they returned to North America for the album's release. Four days after How To Be A Human Being was released, the band appeared on "Jimmy Kimmel Live!", their third appearance on primetime television. The band wrote 11 songs based on 11 different characters, many of which were inspired by people they met and stories they were told during their travels while promoting Zaba. Each character was portrayed on the album cover, and some appeared in music videos for their respective songs. Among the actors portraying the characters were Brock Brenner,