Ticks are blood-sucking arthropods that feed on vertebrate hosts. Although wild and domestic animals are the primary source of tick blood meals, humans can be an accidental host. During a blood meal, a microorganism can be transmitted to the host who can develop a disease. All infectious diseases transmitted by ticks are referred to as tick-borne diseases (TBDs). They are the most prevalent vector-borne diseases in the Northern Hemisphere. Among these diseases, Lyme borreliosis is the most common.

In Europe, Lyme borreliosis does not cause high fevers (> 38°C). Therefore, when a patient presents with a high fever with the notion of exposure to ticks, another etiology must be suspected. Anaplasma phagocytophilum and the tick-borne encephalitis virus are classically described as causing febrile syndromes.

In France, ticks and tick-borne diseases are increasing, particularly those associated with the Ixodes ricinus tick. This tick is mainly present in forest ecosystems with a peak of activity in May. Foresters represent a population with biting ticks and tick-borne diseases, notably Lyme borreliosis.

Inclusion Criteria:

• Major forester (≥18 years old)
• Male or female gender
• ONF (National Forestry Office) staff
• Regularly exposed to ticks in Alsace (exclusively)
• Practicing regular forestry activities in a group
• Agreeing to participate in the study.

Exclusion criteria:

• Refusal to participate in the study

Major forester (≥18 years old), ONF (National Forestry Office) staff regularly exposed to ticks in Alsace.