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Zebrafish Animal Model for the Study of Allergic Reactions in Response to Tick Saliva Biomolecules
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Published on: September 16, 2022

Local reactions to tick bites.

Elena Castelli1, Valentina Caputo, Vincenza Morello

  • 1Department of Dermatology, University of Palermo, Palermo, Italy. sansoknife@tin.it

The American Journal of Dermatopathology
|May 23, 2008
PubMed
Summary

Histopathology of tick bites reveals specific skin alterations, including vascular changes and immune responses. These changes are directly linked to compounds in tick saliva, causing various cutaneous reactions.

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Area of Science:

  • Dermatopathology
  • Histology
  • Immunohistochemistry

Background:

  • Tick bites can cause a range of cutaneous reactions.
  • Understanding the histological features of tick bites is crucial for diagnosis.

Purpose of the Study:

  • To investigate the histological and immunohistochemical characteristics of 25 tick bite cases.
  • To correlate observed skin changes with tick saliva components.

Main Methods:

  • Retrospective analysis of histological and immunohistochemical samples from 25 tick bite cases.
  • Microscopic examination of skin biopsies, including assessment of dermal infiltration, vascular changes, and adnexal structures.

Main Results:

  • Acute lesions showed a cement cone, spongiform dermis, mild inflammation, and vascular proliferation with erythrocyte extravasation.
  • Established lesions included erythema chronicum migrans-like changes, foreign body granulomas, cutaneous lymphoid hyperplasia (T-cell and B-cell types), and tick-bite alopecia.
  • Specific alterations were noted in acute lesions and alopecia, attributed to tick saliva components (antihemostatic, anti-inflammatory, immunomodulatory).
  • Vascular changes and retained mouthparts aided in diagnosing less characteristic lesions.

Conclusions:

  • Tick bite histology reveals specific acute and alopecial changes driven by tick saliva.
  • Cutaneous lymphoid hyperplasia and granulomas are also associated with tick bites.
  • Histopathological examination, including vascular changes, aids in identifying tick bite etiology.