(Datum: 19.September 2011)
Knauer J, Krupka I, Fueldner C, Lehmann J, Straubinger RK. "Evaluation of the preventive capacities of a topically applied azithromycin formulation against Lyme borreliosis in a murine model." J Antimicrob Chemother. 2011 Sep 15.
Our data indicate that topical treatment with a formulation containing azithromycin is a promising approach to prevent Lyme borreliosis shortly after a tick bite.
Details: Laboratory mice were challenged with Borrelia burgdorferi sensu stricto by needle inoculation or via infected ticks as vectors. Then, an azithromycin-containing formulation was applied once daily to the sites of exposure for three consecutive days. In the case of needle inoculation, a 5% azithromycin formulation was applied starting 1 h, 3 days and 5 days after infection.
In the case of tick exposure, 4%, 10% and 20% azithromycin formulations were applied, starting directly after the detachment of the engorged ticks. Concentrations of azithromycin in murine skin were >3800-fold higher than the published minimal inhibitory concentration for B. burgdorferi as soon as 3 h after the first application.
After needle inoculation, spirochaetes were not detectable in all infected mice after treatment, if the first application started 1 h or even after 3 days post-infection.
Furthermore, no borrelial organisms were detected after topical treatment when ticks were used for spirochaete inoculation.