Human rickettsioses in the Batna area, eastern Algeria

Area of Science:

• Medical Microbiology
• Infectious Diseases
• Epidemiology

Background:

• Rickettsioses are a group of bacterial diseases transmitted by arthropods.
• Febrile exanthemas (fever with rash) are common clinical presentations in many regions.
• The prevalence of specific rickettsial infections in eastern Algeria was previously understudied.

Purpose of the Study:

• To investigate the prevalence of various rickettsioses among patients with febrile exanthemas in eastern Algeria.
• To identify the specific Rickettsia species responsible for these infections.
• To determine the clinical significance of rickettsioses in this geographical area.

Main Methods:

• Prospective serological analysis of 108 adult patients with febrile exanthemas.
• Testing for antibodies against nine Rickettsia species using microimmunofluorescence.
• Confirmation of positive results using Western blot.

Main Results:

• Mediterranean spotted fever (Rickettsia conorii conorii) was diagnosed in 5 patients (4.6%).
• Flea-borne spotted fever (Rickettsia felis) and R. aeschlimannii infection were each identified in 2 patients (1.9%).
• Murine typhus (Rickettsia typhi) and epidemic typhus (Rickettsia prowazekii) were diagnosed in 4 (3.7%) and 1 (0.9%) patients, respectively. R. felis and R. aeschlimannii infections were reported for the first time in Algeria.

Conclusions:

• At least five distinct rickettsioses co-exist in eastern Algeria.
• Rickettsioses account for 13% of febrile exanthema cases in the region.
• Typhus group rickettsioses, including epidemic typhus, show a high incidence and warrant attention.