Experts say low-cost vaccines that mayhave helped prevent the kind of salmonella outbreak that led to therecall of more than a half-billion eggs haven't been given to halfthe nation's egg-laying hens.
The vaccines aren't required in the U.S, but officials in GreatBritain say vaccinations have given that country the safety eggsupply in Europe.
The vaccines prevents chickens from becoming infected withsalmonella and passing the bacteria on to their eggs.
Iowa State University poultry veterinarian Darrell Trampelpredicts more producers will begin vaccinating their flocks becauseof the recent outbreak.
But a veterinarian with one of the vaccine makers warns thevaccines won't always work if conditions at egg farms are veryunclean.