I found something on Wikipedia (under Prevention, Vaccine pertaining to this:
A 2014 study tested a vaccine on chickens which offered efficient protection against salmonellosis.[45]
Vaccination of chickens against Salmonella essentially wiped out the disease in the United Kingdom[citation needed]. A similar approach was considered in the United States, but the Food and Drug Administration decided not to mandate vaccination of hens.[46]
I'd assume it's not a widespread practice globally from that wording?