A revision of ANSI Standard 188, , is now available from ASHRAE, the American Society of Heating, Refrigerating, and Air-Conditioning Engineers. According to ASHRAE, the revision clarifies compliance requirements and facilitates adoption of the standard for regulatory purposes. Legionellosis comprises two distinct diseases caused by the bacterium L: Legionnaires’ disease and Pontiac fever. Individuals are typically infected by breathing in droplets of water that originate in building water systems contaminated with . Approximately 10 percent of cases of Legionnaires’ disease are fatal. Since 2000, the number of reported cases of Legionnaires’ disease has increased more than four-fold, according to the Centers for Disease Control and Prevention. More than 6,100 cases of Legionnaires’ disease were reported in 2016. CDC cautions that Legionnaires’ disease is under-reported and the true incidence of the disease is likely higher than the official statistics suggest. “Standard 188 was the first industry standard in the U.S. to address Legionnaire’s disease prevention,” said Paul Lindahl, chair of the ANSI Standard 188 committee. “The 2018 edition of the standard focuses on improved usability, offering better guidance to minimize the risk of this potentially fatal disease and save lives.” More information about ANSI Standard 188 is available from ASHRAE’s .