Figure 1.

Crude incidence of reported confirmed cases of Legionnaires’ disease, by year and race, United States, District of Columbia, and New York City, 2014-2018. The crude incidence of cases per 100 000 population is the number of confirmed Legionnaires’ disease cases reported that year divided by the postcensal population estimate for that year x 100 000. Cases of disease due to Legionella are reported to the National Notifiable Diseases Surveillance System (NNDSS) as legionellosis, which includes Legionnaires’ disease, Pontiac fever, and disease due to Legionella infection at extrapulmonary sites, but is referred to as Legionnaires’ disease in this figure (because almost all legionellosis cases reported in the United States are due to Legionnaires’ disease). The year is when the case was reported to the Centers for Disease Control and Prevention. Data sources: 2014-2018 data are from NNDSS. ²