Bacterial agents in 248 ticks removed from people from 2002 to 2013

Area of Science:

• Medical Entomology
• Bacteriology
• Infectious Diseases

Background:

• Tick-borne diseases pose a significant public health concern.
• Surveillance of tick populations and associated pathogens is crucial for understanding disease transmission dynamics.

Purpose of the Study:

• To identify tick species removed from humans in Marseille, France.
• To detect and characterize bacteria, particularly Rickettsia species, within these tick specimens.
• To correlate tick infections with confirmed cases of tick-borne diseases in humans.

Main Methods:

• Retrospective analysis of 248 tick specimens collected over 10 years.
• Identification of tick species (e.g., Dermacentor, Rhipicephalus, Ixodes).
• Molecular detection of bacterial DNA (e.g., Rickettsia, Anaplasma, Borrelia) using PCR.

Main Results:

• Dermacentor, Rhipicephalus, and Ixodes were the most prevalent tick genera.
• Rickettsia slovaca and Rickettsia raoultii were frequently detected in Dermacentor ticks.
• Rickettsia conorii and Rickettsia massiliae were identified in Rhipicephalus ticks.
• Anaplasma phagocytophylum and Borrelia spp. were found in Ixodes ticks.
• Tick-borne diseases were confirmed in 11 symptomatic individuals.

Conclusions:

• The study highlights the diversity of ticks and tick-borne bacteria in the Marseille region.
• Specific tick genera are associated with particular bacterial species, informing risk assessment.
• Molecular surveillance of ticks is essential for identifying potential threats of tick-borne illnesses.