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Updated: May 28, 2026

Detecting the Lyme Disease Spirochete, Borrelia Burgdorferi, in Ticks Using Nested PCR
Published on: February 4, 2018
A case of Borrelia-associated cutaneous pseudolymphoma in a horse
Kelly P Sears1, Thomas J Divers, Robert T Neff
1Fairfield Equine Associates, 32 Bamabas Road, Newtown, CT 06470, USA.
Abstract:
This case report describes a 10-year-old horse that developed multiple dermal papules over the right masseter area following removal of a tick from the same site 3 months earlier. Histological examination of a biopsy from a papule was suggestive of either a T-cell-rich B-cell lymphoma or cutaneous lymphoid hyperplasia, a form of pseudolymphoma sometimes associated with a tick bite. Positive serological testing and PCR of the biopsy sample for Borrelia in conjunction with immunohistochemical testing of the skin biopsy, the clinical history and response to treatment with doxycycline strongly supported the diagnosis of Borrelia-associated cutaneous pseudolymphoma.
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