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2021•JAAD Case ReportsOpen access

Vesicular spotted fever due to Rickettsia parkeri simulates the clinicopathologic features of rickettsialpox

Ali M. Malik, Penelope Skopis, Clinton Enos, Addie Walker, Kiran Motaparthi

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Abstract

Spotted fever group rickettsiae (SFGR) represent gram-negative intracellular bacteria transmitted to human hosts through tick bites.1,2 Although Rocky Mountain spotted fever (RMSF) represents the prototypical rickettsiosis associated with SFGR, this group also includes Rickettsia parkeri. Among the SFGR, R parkeri may produce a distinct vesicular eruption preceded by an eschar. Thus, R parkeri rickettsiosis may clinically and histopathologically simulate rickettsialpox due to Rickettsia akari. Herein, we present a case of vesicular spotted fever due to R parkeri.

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Spotted fever group rickettsiae (SFGR) represent gram-negative intracellular bacteria transmitted to human hosts through tick bites.1,2 Although Rocky Mountain spotted fever (RMSF) represents the prototypical rickettsiosis associated with SFGR, this group also includes Rickettsia parkeri. Among the SFGR, R parkeri may produce a distinct vesicular eruption preceded by an eschar. Thus, R parkeri rickettsiosis may clinically and histopathologically simulate rickettsialpox due to Rickettsia akari. Herein, we present a case of vesicular spotted fever due to R parkeri.

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Available abstract

Spotted fever group rickettsiae (SFGR) represent gram-negative intracellular bacteria transmitted to human hosts through tick bites.1,2 Although Rocky Mountain spotted fever (RMSF) represents the prototypical rickettsiosis associated with SFGR, this group also includes Rickettsia parkeri. Among the SFGR, R parkeri may produce a distinct vesicular eruption preceded by an eschar. Thus, R parkeri rickettsiosis may clinically and histopathologically simulate rickettsialpox due to Rickettsia akari. Herein, we present a case of vesicular spotted fever due to R parkeri.

Key concepts: Rickettsiosis, Spotted fever, Rickettsia, Biology, Rocky Mountain spotted fever, Eschar, Boutonneuse fever, Virology

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