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Leptospirosis Presence Established In 70% Of UK Herds

03 April 2007

UK - Around 70% of unvaccinated UK herds continue to show evidence of leptospirosis infection, according to 2006 test results released by the Bovine Leptospirosis Information & Screening Service (BLiSS)

Since the launch of the BLiSS initiative in 1999, Schering-Plough Animal Health has monitored the levels of leptospirosis infection in the national dairy and beef herd based on laboratory analysis of milk and blood samples. In 2006 69% of bulk milk samples tested positive for antibodies to the disease. In addition, 77% of BLiSS blood samples submitted last year indicated exposure to leptospirosis infection.

But whilst laboratory analysis of milk and blood samples is undoubtedly a practical and cost-effective diagnostic tool for assessing the overall extent of leptospirosis infection, vets warn that the current technique will not pinpoint the particular strain of the disease threatening an individual herd.

“Unfortunately, routine testing of bulk milk and herd blood samples does not distinguish between the two L.hardjo strains – hardjo-bovis and hardjo-prajitno – that are known to affect cattle in the UK,” cautions Schering-Plough Animal Health livestock veterinary adviser Andrew Montgomery MRCVS.

“We know from research that two strains infect cattle in the UK – with prajitno being more commonly isolated from animals showing severe clinical signs of leptospirosis: for example, those with severe milk drop or aborting. However, routine testing cannot identify the actual strains on an individual farm. Consequently, when it comes to implementing an effective vaccination programme it’s important to use Leptavoid-H, which is the only vaccine that provides protection against both strains of the disease,” he stresses.

Andrew Montgomery says leptospirosis is one of those insidious, costly livestock diseases that commonly results in a grumbling fertility problem in unvaccinated herds. “A series of independent studies has clearly proved the link between the disease and depressed conception rates and this is a significant drain on profits. For example, for every day leptospirosis potentially causes calving index to slip over 365 it’s been estimated that it costs you at least £2.50 per day. So when you consider you only need to stop as little as a two day slippage to make a return on vaccination, it’s an investment well worth making,” he says.

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Source: Farming UK

For more information on Leptospirosis, click here



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