Difference between revisions of "Leptospirosis - Pigs"
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==Introduction== | ==Introduction== | ||
'''Leptospirosis''' is an infective disease caused by the bacteria [[Leptospira]]. There are a number of serovars of the bacteria which vary in their pathogenesis and host specificity. ''L. bratislava'' and ''L. pomona'' are both host adapted to swine and are the most common cause of clinical leptospirosis in pigs. Other serovars which are host adapted to other species can also cause disease in pigs: ''L. icterohaemorrhagiae'' transmitted by rats, ''L. canicola'' by dogs,'' L. grippotyphosa'' by wildlife and rarely ''L. hardjo'' by cattle. Transmission is via urine of infected animals, persistence in the environment relies on soil moisture and water ways. Venereal transmission from carrier boars and sows is also responsible for infection and maintenance of the disease | '''Leptospirosis''' is an infective disease caused by the bacteria [[Leptospira]]. There are a number of serovars of the bacteria which vary in their pathogenesis and host specificity. ''L. bratislava'' and ''L. pomona'' are both host adapted to swine and are the most common cause of clinical leptospirosis in pigs. Other serovars which are host adapted to other species can also cause disease in pigs: ''L. icterohaemorrhagiae'' transmitted by rats, ''L. canicola'' by dogs,'' L. grippotyphosa'' by wildlife and rarely ''L. hardjo'' by cattle. Transmission is via urine of infected animals, persistence in the environment relies on soil moisture and water ways. Venereal transmission from carrier boars and sows is also responsible for infection and maintenance of the disease | ||
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===Laboratory Tests=== | ===Laboratory Tests=== | ||
| − | Paired serum samples showing a positive rise in antibody titre can be used in some cases for confirmation of infection. The organism can be isolated by culture in a special medium, | + | Paired serum samples showing a positive rise in antibody titre can be used in some cases for confirmation of infection. The organism can be isolated by culture in a special medium, of it can be viewed under dark field microscopy. |
==Treatment== | ==Treatment== | ||
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* Straw, B.E. and Taylor, D.J. (2006) '''Disease of Swine''' ''Wiley-Blackwell'' | * Straw, B.E. and Taylor, D.J. (2006) '''Disease of Swine''' ''Wiley-Blackwell'' | ||
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[[Category:Reproductive Diseases - Pig]][[Category:Respiratory Diseases - Pig]][[Category:Urological Diseases - Pig]][[Category:Lymphoreticular and Haematopoietic Diseases - Pig]] | [[Category:Reproductive Diseases - Pig]][[Category:Respiratory Diseases - Pig]][[Category:Urological Diseases - Pig]][[Category:Lymphoreticular and Haematopoietic Diseases - Pig]] | ||
| − | [[Category: | + | [[Category:Expert Review - Farm Animal]] |
Revision as of 16:24, 26 February 2011
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Introduction
Leptospirosis is an infective disease caused by the bacteria Leptospira. There are a number of serovars of the bacteria which vary in their pathogenesis and host specificity. L. bratislava and L. pomona are both host adapted to swine and are the most common cause of clinical leptospirosis in pigs. Other serovars which are host adapted to other species can also cause disease in pigs: L. icterohaemorrhagiae transmitted by rats, L. canicola by dogs, L. grippotyphosa by wildlife and rarely L. hardjo by cattle. Transmission is via urine of infected animals, persistence in the environment relies on soil moisture and water ways. Venereal transmission from carrier boars and sows is also responsible for infection and maintenance of the disease
Signalment
Leptospirosis has a worldwide distribution; it is more prevalent in warm wet climates. The incidence of disease depends on the serovar involved.
Diagnosis
Diagnosis is made on a combination of clinical signs and identification of the organism by laboratory testing.
Clinical Signs
The most common clinical presentation is the chronic form which results in abortion 2-4 weeks before term, still births and weak piglets which die shortly after birth.
- Late term abortion
- Still birth
- Infertility
An acute syndrome has been described in piglets but is very rare, clinical signs are outlined below:
- Pyrexia
- Dyspnoea
- Haemoglobinuria
- Anorexia
- Icterus
- Anaemia
Some serovars can become endemic in a herd causing minimal disease but presenting a major zoonotic concern.
Laboratory Tests
Paired serum samples showing a positive rise in antibody titre can be used in some cases for confirmation of infection. The organism can be isolated by culture in a special medium, of it can be viewed under dark field microscopy.
Treatment
Treatment with antibiotics such as oxytetracycline, enrofloxacin and ampicillin are effective for chronic cases. Early treatment for acute cases with antibiotics may be successful; a blood transfusion may also be needed if anaemia is severe.
In an outbreak the whole herd should be treated with appropriate antibiotics to reduce shedding of the organism in the urine. Depopulation and disinfection of the premises may be necessary in some cases.
A vaccine exists in the USA but is not available in the UK; the protection provided is short lived, it minimises but does not eliminate clinical disease in all cases.
Literature Search
Use these links to find recent scientific publications via CAB Abstracts (log in required unless accessing from a subscribing organisation).
Leptospirosis in pigs publications since 2000
References
- Cowart, R.P. and Casteel, S.W. (2001) An Outline of Swine diseases: a handbook Wiley-Blackwell
- Merck & Co (2008) The Merck Veterinary Manual (Eighth Edition) Merial
- Straw, B.E. and Taylor, D.J. (2006) Disease of Swine Wiley-Blackwell