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Amitraz-impregnated collars to prevent Borrelia transmission
It happens every spring: the tick season strarts, and many owners come and ask for effective protection aganist ticks and tick-transmitted diseases. Is an amitraz-impregnated collar effective enough to prevent the transmission of Borrelia?

This study tries to determine whether an amitraz-impregnated collar could prevent transmission of Borrelia burgdorferi by Ixodes scapularis to dogs. 8 specific-pathogen-free Beagles were included in this laboratory study.

On days -15 and -1, all dogs had negative ELISA results for serum antibodies against B. burgdorferi.
On day 0, 4 dogs were each fitted with an amitraz-impregnated (9%) collar, and 4 dogs served as untreated controls.
On day 7, all dogs were infested with 100/scapularis (approx 50 females and 50 males) with a known B. burgdorferi infectivity rate of 39.4%.

On days 21, 28, 35, 42, 56, 70, and 84, each dog was tested for serum antibodies against B. burgdorferi via ELISA and a western blot technique. Additional ELISA were also performed for serum antibodies against antigenically similar organisms.

By day 70, all control dogs had developed serum ELISA responses ranging from 328 to 510 kinetics-ELISA units (equivalent to end-point titers of approx 43,500 to 60,000),whereas treated dogs remained seronegative throughout the study. Western blot assays performed on all serum samples confirmed that antibodies detected in control dogs reflected responses to specific antigens of B. burgdorferi, whereas treated dogs had no such antibodies. Additional serologic analyses confirmed that antibody responses observed in control dogs were not attributable to antigenically similar organisms.

Amitraz-impregnated collars prevented transmission of B. burgdorferi in 4 of 4 treated dogs and may be a useful management tool for prevention of borreliosis in dogs.

Source: Elfassy OJ, Goodman FW, Levy SA, Carter LL (2001): Efficacy of an amitraz-impregnated collar in preventing transmission of Borrelia burgdorferi by adult Ixodes scapularis to dogs. In: J Am Vet Med Assoc 2001 Jul 15;219(2):185-9




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