Hysolv Animal Health will be marketing the vaccine in the UK and Ireland. The UK launch marks the beginning of a series of Europe-wide launches.
The live vaccine is given orally through the water supply in a three-dose regime that protects against both Salmonella Enteritidis (SE) and Salmonella Typhimurium (ST). It also protects against other SE strains and the newly-emerging monophasic Salmonella Typhimurium strains.
An 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 only six days, a week earlier than most other vaccines, and remains effective for up to 63 weeks after the third vaccination, providing an extra four weeks of protection.
A further 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 vaccines 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. “If any should be found, the new PCR (Polymerase Chain Reaction) test shrinks the testing time to just two to three hours,” commented Dr Windhorst.
To comply with the British Lion Code of Practice pullet rearers are required to test their birds for salmonella infection before they are moved to the layer house.
Salmovac 440 has been approved for use by the British Egg Industry Council, which administers the Lion Code.
“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,” said Dr Windhorst