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Journal of Clinical Microbiology, May 1999, p. 1361-1365, Vol. 37, No. 5
0095-1137/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Prevalence of Borrelia burgdorferi in Ixodes ricinus Ticks in Urban Recreational Areas of Helsinki

Juha Junttila,1 Miikka Peltomaa,2,* Hanna Soini,3 Merja Marjamäki,3 and Matti K. Viljanen3

Ministry of Agriculture and Forestry, 00171 Helsinki,1 Department of Otolaryngology, Helsinki University Central Hospital, 00290 Helsinki,2 and National Public Health Institute, 20520 Turku,3 Finland

Received 27 October 1998/Returned for modification 4 December 1998/Accepted 28 January 1999

Lyme borreliosis, an infection caused by the tick-borne spirochete Borrelia burgdorferi, is a major health problem for populations in areas of endemicity in the Northern Hemisphere. In the present study we assessed the density of ticks and the prevalence of B. burgdorferi sensu lato among ticks in popular urban recreational areas of Helsinki, Finland. Altogether 1,688 Ixodes ricinus ticks were collected from five areas located within 5 km of the downtown section of Helsinki, and 726 of them (303 nymphs, 189 females, and 234 males) were randomly chosen for laboratory analysis. The midguts of the ticks were divided into three pieces, one for dark-field microscopy, one for cultivation in BSK-II medium, and one for PCR analysis. Ticks were found in all the study areas; their densities varied from 1 to 36 per 100 m along which a cloth was dragged. The rate of tick infection with B. burgdorferi sensu lato varied from 19 to 55%, with the average being 32%. Borellia afzelii was the most predominant genospecies in all the areas, and no B. burgdorferi sensu stricto isolates were detected. Only two ticks were concurrently infected with both B. afzelii and Borrelia garinii. Dark-field microscopy gave more positive results for B. burgdorferi than did cultivation or PCR analysis. However, the agreement between all three methods was fairly good. We conclude that Lyme borreliosis can be contracted even in urban environments not populated with large mammals like deer or elk. The disease should be taken into account in the differential diagnosis of certain symptoms of patients from these areas, and the use of measures to improve the awareness of the general population and health care officials of the risk of contracting the disease is warranted.

* Corresponding author. Mailing address: Department of Otolaryngology, Helsinki University Central Hospital, Haartmaninkatu 4 E, 00290 Helsinki, Finland. Phone: 358-9-471 5067. Fax: 358-9-288 359. E-mail: miikkap{at}nekku.pp.fi.

Journal of Clinical Microbiology, May 1999, p. 1361-1365, Vol. 37, No. 5
0095-1137/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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