1887

Journal of Medical Microbiology logo

Volume 57, Issue 4

A sustained-release formulation of doxycycline hyclate (Atridox) prevents simultaneous infection of and transmitted by tick bite Free

Abstract

Current prophylaxis for infected tick bites consists of personal protective measures directed towards ticks. This study compared the efficacy of a single oral dose of doxycycline with that of a single injection of sustained-release doxycycline in a model of Lyme borreliosis and infection. Dosages of doxycycline were equilibrated based on previously determined peak plasma levels in mice [oral, 2.4 μg (ml plasma); sustained release, 1.9 μg (ml plasma)] determined 8 h after inoculation. In challenge experiments where five -infected and five -infected nymphs were used per mouse, only 20 and 30 % of mice were protected from and infection, respectively, using oral doxycycline. In contrast, 100 % of mice receiving sustained-release doxycycline were protected from infection, as indicated by real-time PCR of blood samples, quantitative PCR and culture isolation of spleen samples, and protected against infection as demonstrated by culture of ear, heart and bladder. Although 15–40 copies of could be amplified from the spleens of mice treated with sustained-release doxycycline, no viable from these spleens could be cultured in HL-60 cells. In contrast, 7/10 mice receiving oral doxycycline were PCR- and culture-positive for , with copy numbers ranging from 800 to 10 000 within the spleen, as determined by quantitative PCR. Other correlates with infection included a significant difference in spleen mass (mean of 110 mg for sustained-release treatment versus a mean of 230 mg for oral treatment) and the number of splenic lymphoid nodules (mean of 8 for sustained-release treatment versus mean of 12.5 for oral doxycycline) as determined by histopathology. These studies indicate that a single injection of a sustained-release formulation antibiotic may offer a viable prophylactic treatment option for multiple infectious agents in patients presenting with tick bites.

  • Received:
  • Accepted:
  • Published Online:
Keyword(s): CDC, Centers for Disease Control and Prevention
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2008-04-01
2024-12-05
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A sustained-release formulation of doxycycline hyclate (Atridox) prevents simultaneous infection of Anaplasma phagocytophilum and Borrelia burgdorferi transmitted by tick bite
J. Med. Microbiol. 57, 463 (2008); https://doi.org/10.1099/jmm.0.47535-0
/content/journal/jmm/10.1099/jmm.0.47535-0
/content/journal/jmm/10.1099/jmm.0.47535-0
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