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You thinking about vacinating them ? It's more for the chickens than it is for you, i think the only thing you can get from chicken eggs is salmonella and salmonella can't be vacinated against, the only thing you can do about it is keeping the chicken eggs away from high amounts of feces (which is where salmonella is contained), the vaccination of your chickens would be more for the chickens to be protected against diseases, so that you don't lose your whole poultry house, I think that's the right english word, at the same time