Duration of immunity in dogs vaccinated against leptospirosis with a bivalent inactivated vaccine.

Arlo Guthrie — Thu, 08 Oct 2009 16:59:39 GMT

Current Revision posted to Abstracts, Short Communications & Research by Arlo Guthrie on 10/8/2009 4:59:39 PM

Klaasen HL, Molkenboer MJ, Vrijenhoek MP, Kaashoek MJ.

Department of Bacteriological R&D, Intervet International BV, PO Box 31, 5830 AA Boxmeer, The Netherlands. eric.klaasen@intervet.com

Duration of immunity in dogs induced with current commercial inactivated leptospirosis vaccines and evaluated against experimental infection, to date, has hardly been documented. The purpose of the present work was to assess the duration of immunity in dogs that is attainable with a commercial inactivated bivalent leptospirosis vaccine. For this purpose, young dogs were vaccinated twice followed by challenge with either Leptospira interrogans serovar canicola or L. interrogans serovar icterohaemorrhagiae 5 weeks, 27 weeks or 56 weeks after the second vaccination. For assessment of the duration of immunity, titres of agglutinating serum antibodies were measured before and after challenge, and the effects of challenge on a variety of parameters were determined including reisolation of challenge organisms from blood, urine and kidney. Both challenge strains induced a generalised infection in control dogs, the canicola strain being most virulent. From the results with different parameters it appeared that the two vaccinations induced a high rate of protection from generalised infection with canicola and icterohaemorrhagiae at 5, 27 and 56 weeks after the second vaccination. In addition, after 56 weeks, still a high level of immunity against renal infection with sv. canicola and, as a consequence, urinary shedding of sv. canicola bacteria, was demonstrated. It was, therefore, concluded that with this vaccine, using this vaccination schedule, a duration of immunity of 1 year can be attained against infection with both serovars.

Vet Microbiol. 2003 Aug 29;95(1-2):121-32.

Tags: vaccine, leptospirosis, leptospira, Dogs

Duration of immunity in dogs vaccinated against leptospirosis with a bivalent inactivated vaccine.

Alex Gough — Mon, 15 Jun 2009 16:12:58 GMT

Revision 5 posted to Abstracts, Short Communications & Research by Alex Gough on 6/15/2009 4:12:58 PM

Klaasen HL, Molkenboer MJ, Vrijenhoek MP, Kaashoek MJ.

Department of Bacteriological R&D, Intervet International BV, PO Box 31, 5830 AA Boxmeer, The Netherlands. eric.klaasen@intervet.com

Vet Microbiol. 2003 Aug 29;95(1-2):121-32.

Tags: dogs, leptospirosis, leptospira, vaccine

Duration of immunity in dogs vaccinated against leptospirosis with a bivalent inactivated vaccine.

Arlo Guthrie — Mon, 15 Jun 2009 16:04:58 GMT

Revision 4 posted to Abstracts, Short Communications & Research by Arlo Guthrie on 6/15/2009 4:04:58 PM

Klaasen HL, Molkenboer MJ, Vrijenhoek MP, Kaashoek MJ.

Department of Bacteriological R&D, Intervet International BV, PO Box 31, 5830 AA Boxmeer, The Netherlands. eric.klaasen@intervet.com

Vet Microbiol. 2003 Aug 29;95(1-2):121-32. <script language="JavaScript1.2"></script> Links

Vet Microbiol. 2009 May 28;137(1-2):137-45. Epub 2009 Jan 4. <script language="JavaScript1.2"></script> Links

Onset and duration of protective immunity against clinical disease and renal carriage in dogs provided by a bi-valent inactivated leptospirosis vaccine.

Minke JM, Bey R, Tronel JP, Latour S, Colombet G, Yvorel J, Cariou C, Guiot AL, Cozette V, Guigal PM.

MERIAL S.A.S., 254 rue Marcel Mérieux, 69007 Lyon, France.

Protection against clinical disease and prevention of the renal carrier state remain the key objectives of vaccination against leptospirosis in the dog. In the present paper, groups of dogs were vaccinated twice with a commercial bacterin (EURICAN((R)) L) containing Leptospira interrogans serovars icterohaemorrhagiae and canicola and challenged with heterologous representatives of both serovars at 2 weeks (onset of immunity) or 14 months (duration of immunity) after the second vaccination. Control dogs were not vaccinated against leptospirosis and kept with the vaccinated dogs. The challenges, irrespective of the serovar, reliably produced clinical signs consistent with Leptospira infection in the control pups with up to 60% mortality. As expected clinical disease in the adult controls was less severe, but we were able to induce morbidity and mortality as well. Under these extreme challenge conditions, clinical signs in the vaccinated dogs were rare, and when observed, mild and transient in nature. Following experimental infection, 100% of the control pups and 83% of the adult controls became renal carriers. Despite the heavy challenges, none of the 18 vaccinated puppies (onset of immunity studies) and only 2 out of the 16 vaccinated adult dogs (duration of immunity studies) developed a renal carrier state. These results show that a primary course of two doses of EURICAN((R)) L provided quick onset and long-term protection against both clinical leptospirosis and the renal carrier stage. This vaccine should provide veterinarians with a powerful tool to prevent clinical disease in dogs and zoonotic transmission of leptospirosis to humans.

Tags: dogs, leptospirosis, leptospira, vaccine

Duration of immunity in dogs vaccinated against leptospirosis with a bivalent inactivated vaccine.

Arlo Guthrie — Mon, 15 Jun 2009 16:03:32 GMT

Revision 3 posted to Abstracts, Short Communications & Research by Arlo Guthrie on 6/15/2009 4:03:32 PM

Klaasen HL, Molkenboer MJ, Vrijenhoek MP, Kaashoek MJ.

Department of Bacteriological R&D, Intervet International BV, PO Box 31, 5830 AA Boxmeer, The Netherlands. eric.klaasen@intervet.com

Onset and duration of protective immunity against clinical disease and renal carriage in dogs provided by a bi-valent inactivated leptospirosis vaccine.

Minke JM, Bey R, Tronel JP, Latour S, Colombet G, Yvorel J, Cariou C, Guiot AL, Cozette V, Guigal PM.

MERIAL S.A.S., 254 rue Marcel Mérieux, 69007 Lyon, France.

Tags: dogs, leptospirosis, leptospira, vaccine

Duration of immunity in dogs vaccinated against leptospirosis with a bivalent inactivated vaccine.

Arlo Guthrie — Mon, 15 Jun 2009 16:03:07 GMT

Revision 2 posted to Abstracts, Short Communications & Research by Arlo Guthrie on 6/15/2009 4:03:07 PM

Klaasen HL, Molkenboer MJ, Vrijenhoek MP, Kaashoek MJ.

Department of Bacteriological R&D, Intervet International BV, PO Box 31, 5830 AA Boxmeer, The Netherlands. eric.klaasen@intervet.com

Onset and duration of protective immunity against clinical disease and renal carriage in dogs provided by a bi-valent inactivated leptospirosis vaccine.

Minke JM, Bey R, Tronel JP, Latour S, Colombet G, Yvorel J, Cariou C, Guiot AL, Cozette V, Guigal PM.

MERIAL S.A.S., 254 rue Marcel Mérieux, 69007 Lyon, France.

Tags: dogs, leptospirosis, leptospira, vaccine

Leptospira vaccinations

Alex Gough — Mon, 15 Jun 2009 14:48:27 GMT

Revision 1 posted to Abstracts, Short Communications & Research by Alex Gough on 6/15/2009 2:48:27 PM

Vet Microbiol. 2003 Aug 29;95(1-2):121-32. <script language="JavaScript1.2"></script> Links