A suburban focus of Lyme borreliosis situated 11 km from the southern border
of the city of Lublin (eastern Poland) was characterized. The focus covers an area of circa
100 km2, surrounding 3 localities inhabited by circa 7,500 people engaged mostly in
farming. It was demonstrated that on the area of focus the infection rate of Ixodes ricinus
ticks with Borrelia burgdorferi, frequency of serological response of inhabitants to the
antigen of Borrelia burgdorferi, and incidence of Lyme borreliosis were signifi cantly
(p<0.001) greater compared to the whole territory of Lublin province, and were respectively
13.1% vs. 4.7%, 33.0% vs. 13.7%, and 0.002% vs. 0.00075%.