Effects of Recent Leptospira Vaccination on Whole Blood Real‐Time PCR Testing in Healthy Client‐Owned Dogs

Journal of Veterinary Internal Medicine

J.N. Midence¹  C.M. Leutenegger²  A.M. Chandler¹ 

[1] Department of Clinical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY;IDEXX Reference Laboratories, West Sacramento, CA

关键词: Canine leptospirosis;    Diagnostic;    Real‐time PCR;    Vaccine;   

DOI  :  10.1111/j.1939-1676.2011.00852.x

来源: Wiley

【 摘 要 】

Abstract

Background

Bacterin-based canine Leptospira vaccines could present a challenge for the use of whole blood real-time polymerase chain reaction (PCR) as a diagnostic tool. Recent vaccination could induce positive results if the targeted DNA fragment is present within the vaccine and in the blood of the recently vaccinated dog.

Objectives

The objective of this study was to assess whether 2 available 4-serovar vaccines induce a positive real-time PCR reaction in the blood of healthy recently vaccinated dogs.

Animals

Twenty healthy dogs.

Methods

This was a prospective study. Dogs were assigned to 1 of 2 vaccine groups. Both vaccines were culture-based and include Leptospira interrogans serovars Pomona, Canicola, and Icterohaemorrhagiae and Leptospira kirschneri serovar Grippotyphosa. Whole blood for real-time PCR and serum for the microscopic agglutination test (MAT) were collected prior to and 3 and 7 days after vaccination and weekly thereafter for 8 weeks. Two real-time PCR tests targeting 2 different genes were performed independently in a blinded fashion.

Results

Both Leptospira vaccines produced positive real-time PCR reactions when assayed undiluted or diluted 1 : 100 in canine blood. However, blood samples drawn from all dogs at all time points after vaccination were negative on PCR. All dogs developed MAT titers.

Conclusions and Clinical Importance

Recent vaccination with 2 commercially available vaccines does not interfere with the use of real-time PCR for the identification of acute Leptospira infection in dogs.

【 授权许可】

Unknown   
Copyright © 2011 by the American College of Veterinary Internal Medicine