CEVA Animal Health has launched a new laboratory method to differentiate its Cevac Salmovac vaccine strain from field strains of Salmonella Enteritidis.

The pharmaceutical firm is working with Biomerieux’s ASAP culture medium to undertake the sampling, which is a requirement under Version 8 of the British Lion Code of Practice.

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The Cevac Salmovac vaccine strain, which protects against Salmonella Enteritidis and Salmonella Typhimurium, can occasionally be detected during routine sampling.

When this occurs, the accredited laboratory can carry out the differentiation testing whilst also sending the samples to the official confirmatory laboratory for final identification.

The ASAP Salmonella differentiation test has 100% sensitivity and 100% specificity for differentiating the Cevac Salmovac vaccine strain from any Salmonella field strain; Ceva Salmovac grows dark blue/purple colonies on ASAP media, while all other Salmonella bacteria field strains grow pink/red colonies.

“Several tests are available to differentiate Cevac Salmovac from Salmonella field strains, however using ASAP as a second medium significantly improves and speeds up the differentiation process, ensuring that laboratories can quickly and efficiently detect the presence of the Cevac Salmovac strain,” said Pippa Abbey, poultry national veterinary services manager at Ceva Animal Health.