African tick-bite fever (ATBF), a recently rediscovered rickettsiosis of the spotted fever group, is caused by Rickettsia africae, an obligate intracellular, gram-negative, rod-shaped bacterium, transmitted by cattle ticks of the Amblyomma genus (1-5).
Eschars have been reported and their pathologic features have been described in other spotted fever rickettsioses such as Mediterranean spotted fever, North Asian tick typhus, or Queensland tick typhus (9-11).
This phenomenon was noted for the parallel reemergence of RMSF and Mediterranean spotted fever during the 1970s and 1980s (14).
Ecological study of Rocky Mountain spotted fever in Costa Rica.
larval ticks from Rattus rattus trapped in Chiangmai Province, Thailand, in 1962 (1) and has recently been determined to be a strain of Rickettsia honei, the etiologic agent of Flinders Island spotted fever (2).
Blood was collected and submitted to the Armed Forces Research Institute of Medical Sciences, Thailand, where the serum was determined to be positive for antibodies to spotted fever rickettsiae.
From 1985-87, the Riverside County reservoir yielded five line-class world records for spotted bass that still hold, including two lake-best 9-1/4-pounders taken on 6- and 8-pound line.
The spotted bass, very similar to the largemouth but with a smaller maw and considered a much more spirited fighter, was imported to Perris in the mid-1970s.
Infection with Rickettsia rickettsii, known as Brazilian spotted fever (BSF) or Rocky Mountain spotted lever (RMSF), occurs in the United States, Canada, Mexico, Costa Rica, Panama, Colombia, Brazil, and Argentina (1-3).
Immunohistochemical examination for spotted fever rickettsiae was performed according to the method of Dumler et al.
These isolates had been previously identified by serologic tests as belonging to the spotted
fever group rickettsiae.
Eight new rickettsioses, three of which were described in Europe, have been identified in the past 13 years, including Japanese spotted
fever due to R.
The diagnosis of Mediterranean spotted
fever was made by indirect immuno-fluorescent assay against R.
fever is the generic name given to a variety of tickborne rickettsial diseases distributed worldwide.
conorii has long been considered the only African spotted
fever group rickettsia, responsible for both Mediterranean spotted
fever and ATBF.