Caused by Brucella canis
In males, the main sign is epididymitis of one or both testes, and infertility. Testicular atrophy and a moist scrotal dermatitis may be present. Semen from infected males usually contains large numbers of abnormal sperm and inflammatory cells, especially during the first 3 post-infection months. Chronically infected males may have no sperm, or reduced numbers of immature sperm. Autoimmune (anti-sperm) antibodies are present and probably contribute to male infertility. Non specific signs in both sexes include lethargy, loss of libido, premature aging and generalized lymph node enlargement. B. canis has been isolated from field cases of diskospondylitis, a condition that also has been reproduced experimentally in SPF dogs. Recurrent uveitis has been occasionally reported in infected dogs after several weeks/months of infection. infected males harbour organisms in the prostate gland and epididymides for several months. Bacteria are disseminated the seminal fluids and urine. In males another sign is decreasing infertility.
Treatment is expensive and cures are difficult to achieve, especially in
chronically infected males. Repeated blood cultures and serologic
required . Recrudescence of the infection after the cessation of antibiotic
treatment is common. Even if the organism can be successfully
frequently remain sterile because of irreversible damage to the testes and
epididymides. Spaying or castration is believed to reduce the risk of
transmission from infected dogs; however, this hypothesis has not been
experimentally and neutering does not eliminate organisms from the body.
neutered dogs should receive a course of antibiotics. The most
practical treatment results have been obtained with a combination of a
tetracycline drug, e.g., tetracycline hydrochloride, doxycycline,
and streptomycin administered during the first 3 months of infection.
80% cure rates have been achieved in kennels, where dogs initially
infected were euthanized and additional ("early") cases were treated. A
more difficult to achieve in chronic infections.
If available, dihydrostreptomycin (10 mg/kg IM bid) is given for the initial 7 days of treatment together with a tetracycline antibiotic (25 mg/kg orally tid), which is continued for 4 weeks. During the last 7 days of tetracycline therapy, streptomycin is again given. In some instances where the first course failed, a second course of treatment has been successful. Since streptomycin is no longer available in some countries for treatment of dogs, gentamicin has been recommended by some clinicians as a substitute antibiotic. However, there is insufficient data to recommend gentamicin, and preliminary studies indicate that its efficacy is unsatisfactory, except in very early cases - i.e., in dogs infected for less than 1 - 2 months. Treatment is not recommended for breeding dogs, or when long-term (3 months) follow-up is unlikely. Treatment failures are especially common in infected males where organisms are commonly sequestered in the prostate gland and epididymides.
Testing and elimination of infected dogs is the only proven method of eradication of B. canis from an infected kennel. An attempt should be made to identify the source of the infection - unfortunately, this has rarely been accomplished since breeders are reluctant to admit culpability.
Management of infected dogs is time consuming and expensive.
be prepared to address owners' concerns and render judicious advice,
vary according to circumstances. Prevention is essential to avoid the
infection in a breeding kennel. As soon as canine brucellosis is
diagnosed in a
kennel, vigorous measures must be implemented until the disease has been
eradicated. Infected kennels should be quarantined, even though most
do not have formal regulations. Lack of such measures has lead to
international, spread of B. canis infection.
castrate + treatment. Treatment uncertain; chances greater for success
infections. Follow-up serology for 3 months post-treatment. Cost great;
disappointment common. In male dogs, infection of the testicles
to infertility due to anti-sperm antibodies developed as the body
fight off the bacterial infection. The testes may atrophy after the initial
period of swelling. Scrotal enlargement or infection of the skin over the
scrotum may be seen
female and male dogs there may be infection of spinal discs
which can cause back pain and rear leg weakness or even paralysis. Eye
inflammation may be seen in either sex.
It is not usually possible to culture Brucella canis bacteria from the blood or affected tissues so diagnosis is usually done by titer testing. There is a kit available to veterinarians for testing in their office. It is usually best to retest any dogs found positive on this test with other testing methods since there is a fairly high rate of false positives using the in-house test kit.
Brucellosis is very difficult to treat successfully. A combination of minocycline and streptomycin is thought to be most effective but is expensive. Tetracycline can be substituted for the minocylcine to reduce costs but also lowers the effectiveness of treatment. All infected animals should be neutered or spayed to prevent sexually related transmission. All infected animals should be considered to be lifelong carriers of the disease, even if treated.
probably be best not to breed dogs without testing both the male and
this disease. Breeding should be a deliberate choice -- not a random
breeding kennels, routine isolation of new dogs would be a very good
isolation and negative tests at entry into the kennel and one month
should be safe to let the new dog mix with the others in the kennel. If
infection is suspected at any time, quaternary ammomium (like Roccal Rx)
iodophor (Betadine Rx) disinfectants can kill Brucella organisms in the
to limit spread of the disease.
Brucella canis is sexually transmitted by the mating of infected males and females. An infected male will spread the brucella bacteria via his semen and urine. Usually the bitch appears healthy with no signs of disease or indication that she is a carrier of the bacteria. She can also spread brucella to other animals through her urine, aborted pups, or more commonly at time of mating. Once pregnant, the bacteria will also infect the developing foetuses causing illness. Litters of infected bitches are often aborted in the last two weeks of gestation, or the puppies may die shortly after birth. The aborted pups are usually partially decomposed and accompanied by a grey to green vaginal discharge, which can contain high levels of bacteria. People should avoid contact with dead foetuses or discharges from aborting dogs.
One last thing. It is possible that brucellosis caused by Brucella canis may be a zoonotic disease -- meaning that people could potentially be infected by this organism. It is something to think about when handling infected dogs. Wear gloves around any body fluids and be careful about contaminating yourself in any way.
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