Hysolv Animal Health has announced the launch of Salmovac 440, a new live salmonella vaccine for poultry which the company claims gives earlier, stronger and longer-lasting immunity than other salmonella vaccines. 

The vaccine is given orally through the water supply in a three-dose regime that protects against Salmonella Enteritidis (SE) and Salmonella Typhimurium (ST). It also protects against other SE strains and the newly-emerging monophasic Salmonella Typhimurium strains.

Hysolv says the advantage for farmers is that the vaccine strain is robust and can survive in more hostile conditions. It therefore remains effective where the water delivery system is less than ideal.

The first dose is administered from Day 1 followed by a second dose at six weeks and a third as early as 11 weeks. Salmovac 440 protects chicks after six days and remains effective for up to 63 weeks after the third vaccination, providing an extra four weeks of protection.

Hysolv says another important benefit to egg producers is that the earlier final vaccination at 11 weeks means that the birds can be moved into the laying house as early as 16 weeks old if required — a significant management advantage on some farms.

During the development of the vaccine it was found that the third live vaccination tended to ‘shut down’ any prolonged shedding of the vaccine strain. This, coupled with the earlier vaccination at 11 weeks, helps solve the issue of the vaccine strain being found at transfer to the layer house. Dr Daniel Windhorst, salmonella vaccine specialist with IDT Biologika, said: "If any should be found, the new PCR (Polymerase Chain Reaction) test shrinks the testing time to just two to three hours."

Daniel added: "Although the UK has one of the lowest percentages of salmonella in its flocks, almost one-third of cases were of S Typhimurium. In most continental countries the percentage is much higher, so the extra cover provided by this vaccine is important."

Salmovac 440 has been approved for use by the British Egg Industry Council, which administers the Lion Code.

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