Rickettsiosis Cases in the US Increasing

CDC Photo: Rocky Mountain spotted fever rash (Rickettsia rickettsii) on child’s face.

Vector-Borne and Zoonotic Diseases (Bishop, A. et al.) published “Increasing Incidence of Spotted Fever Group Rickettsioses in the United States, 2010–2018” on September 9, 2022. The authors of this study analyzed and summarized surveillance data (2010-2018) reported to the Centers for Disease Control and Prevention (CDC) through the National Notifiable Diseases Surveillance System on cases of spotted fever group Rickettsiosis. 

According to statistics collected, white males were at the highest risk. It is unclear how many cases were attributed to Rocky Mountain spotted fever (Rickettsia rickettsii), and how many were attributed to another spotted fever group, Rickettsioses. 

There were 36,632 reported cases of spotted fevers during the study period, with numbers indicating a significant increase in the incidence of this disease during the study period. Arkansas reported the highest incidence of cases and California the lowest. 


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