Bartonella quintana in Ethiopian lice

Area of Science:

• Medical Entomology
• Bacterial Pathogenesis
• Molecular Diagnostics

Background:

• Lice are vectors for various human pathogens.
• Bartonella quintana is a bacterium typically transmitted by the human body louse (Pediculus humanus humanus), causing diseases like trench fever.
• Previous research has primarily linked Bartonella quintana to clothing lice, with rare reports in head lice.

Purpose of the Study:

• To investigate the prevalence of specific pathogenic bacteria, including Bartonella spp., in head and clothing lice from Jimma, Ethiopia.
• To identify the Bartonella species found in lice and assess their potential role in disease transmission within the region.

Main Methods:

• Genomic DNA was extracted from pooled head and clothing lice samples.
• Polymerase Chain Reaction (PCR) was employed to screen for Bartonella spp., Borrelia spp., Coxiella burnetii, Rickettsia spp., and Yersinia pestis.
• Positive Bartonella samples were further analyzed by sequencing the ribosomal intragenic transcribed spacer region (ITS) for precise identification.

Main Results:

• None of the 102 lice pools tested positive for Borrelia spp., Coxiella burnetii, Rickettsia spp., or Yersinia pestis.
• Bartonella species were detected in 6 out of 65 (9.2%) head lice pools and 1 out of 33 (3.0%) clothing lice pools.
• Sequencing identified all detected Bartonella isolates as Bartonella quintana.

Conclusions:

• The study identified Bartonella quintana in both head and clothing lice in Jimma, Ethiopia.
• The higher prevalence in head lice compared to clothing lice suggests head lice may be competent reservoirs for maintaining Bartonella quintana infections in this area.
• Further research is warranted to understand the epidemiological significance of Bartonella quintana in head lice and its implications for public health in Ethiopia.