Injections for Salmonella

It isn't essential to vaccinate.  Most vaccines come in 500 or 1000 dose ampoules and then have to be kept in a cold chain and used within an hour or so of being opened, so for a sole keeper it is not usually financially viable to dose a home flock.

Here is some information I found online (good old google!)

Intervet (Shering-Plough Pharma) make two salmonella vaccines, one live, which is given by water is 74.40 euros for  a 1000 dose vial

and an inactivated vaccine (which is used in the UK)  This is given by injection 4 weeks apart at 12 and 16 weeks.  Immunity is assumed only 4 weeks after the second administration, and immunity will last until 56 - 60 weeks of age.  It is not to be used for birds in lay, and you can buy it on prescription for 166 euros for a single 1000 dose vial (two vials would be needed, one for the first injection and one of rthe second).

The proces come from a pharmacy in Austria, as I couldn't find any information about buying is externally to a vet in the UK.

You can get more information here from Intervet

Only hybrids that are bred for the poultry industry are generally vaccinated, most that are bred for hobby bird keepers are not vaccinated. Those that come from the large producers and are bought at a very young age (such as day olds) will not be vaccinated. Also there are so many different vaccines (not just for Salmonella) it really isn't viable to vaccinate.

no it's because they are generally bred by hobbyists like us who don't have the quantity of birds that need the vaccine at the same time - remember most vaccines come in doses of 500 upwards, and some vaccines such as the Mareks vaccine have to be administered within an hour of opening otherwise it is useless. Vaccinated also is no guarantee that the bird will not get the illness - if you look back on Grumpydads experiences a year or so ago he had vaccinated birds who all but 1 died of Mareks. He then bought some pure breeds of a breed that are supposed to be hardier and  more immune to it but sadly these got Mareks from his 1 remaining bird (who turned out to now be a carrier as often happens to those which recover from it). Another point is that some vaccines are available as live vaccines and I heard that some show people do not like this.

Thanks for explaining that to me, it's good to know these things