Serosurvey of Antibodies Against B. burgdorferi, E. canis, E. ewingii, E. chaffeensis, and Anaplasma in Dogs from the United States
ACVIM 2008
D. Daniluk; B. Thatcher; J. Saucier; R. Krah; M. Beall; T. O'Connor; R. Chandrashekar; B.A. Stillman
IDEXX Laboratories
Westbrook, ME, USA

Tick-borne diseases in dogs can be produced by a number of infectious agents including Anaplasma sps., Borrelia burgdorferi, Ehrlichia canis, Ehrlichia chaffeensis, and Ehrlichia ewingii. In an effort to understand the organism-specific infection rates in dogs, we examined over 4000 serum samples, obtained from a network of diagnostic laboratories, from dogs suspected of having a tick-borne illness. Serum samples were tested on a prototype in-clinic ELISA (IDEXX Laboratories), using genus- and species-specific markers for the presence of antibodies to the above agents. The data obtained from this evaluation are summarized below.

Species

% incidence in dogs
suspected of
tick-borne illness

Number of samples
with single infection

Number of samples
with co-infection found
(2 or more)

Anaplasma sps.

11.7

232

234

Borrelia burgdorferi

46.3

1647

233

Ehrlichia canis

13.2

464

65

Ehrlichia chaffeensis

0.9

26

12

Ehrlichia ewingii

3.6

75

70

Of the 4000 samples tested, 46.3% had antibodies to B. burgdorferi; 11.7% to Anaplasma, while 13.2%, 0.9%, and 3.6% had antibodies to E. canis, E. chaffeensis, and E. ewingii analytes, respectively. The highest incidence of co-infection was for Anaplasma/Borrelia dual infection (21.5% of samples) followed by E. canis/E. ewingii (1.1%). The demographics of the data, despite the limitation of samples being sourced from discrete laboratory locations, reveal endemic areas of both borreliosis and anaplasmosis in the Northeast, upper Midwest, and Pacific coast regions. The data also show widespread incidence of E. canis across the country with endemic pockets of E. chaffeensis and E. ewingii.

Speaker Information
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Brett Stillman


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