PMID: 3750784Jul 26, 1986Paper

Problems associated with the serological diagnosis of Leptospira interrogans serovar hardjo infection in bovine populations

The Veterinary Record
S C HathawayD G Pritchard

Abstract

Data combining sequential bacteriology and serology from a longitudinal study of a dairy herd were used to demonstrate the limitations of serology as a diagnostic method in cross-sectional sampling of bovine populations. Whole-herd point serological prevalences showed considerable variation over a two-year sampling period (38.8 to 76.2 per cent), and this was mainly due to varying age-specific prevalence. Owing to the rapid decline in titres and the varying persistence of infection, point serological prevalences failed to approximate to cumulative infection rates (either past or present) at different times of the year. A higher estimate of the number of susceptible animals in the herd than is the case results in inaccurate information on true incidence rates and can confuse assessments of the susceptibility of different age groups, especially if only small numbers are sampled. A sampling exercise demonstrated that a 10-cow sample usually provided little useful information other than establishing the presence or absence of hardjo in the herd. Increasing the sample size markedly improved epidemiological information, investigations of clinical disease, assessments of vaccination needs and public health tracebacks. Preferably 10 se...Continue Reading

Citations

Oct 27, 2005·Tropical Animal Health and Production·S BoqvistU Magnusson
Oct 27, 2001·Preventive Veterinary Medicine·C Alonso-AndicoberryL M Ortega-Mora
Jul 21, 2005·New Zealand Veterinary Journal·J S O'Keefe
Apr 9, 2001·Clinical Microbiology Reviews·P N Levett
Feb 24, 1999·Australian Veterinary Journal·M B HeinemannL J Richtzenhain
Apr 1, 1991·The Veterinary Quarterly·P P DomK Van Ommeslaeghe
Jan 6, 2009·Annals of the New York Academy of Sciences·L L LeonB L G Velazquez
Feb 27, 2020·Animals : an Open Access Journal From MDPI·Sreekumari RajeevEsteban Ellis

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