Salmonella is not airborne. You’d have to lick your fingers, kiss your chickens’ butt, eat food that you’ve touched with your bare hands that you also touched the chickens with or food you’ve dropped on the ground in their run. Not all chickens carry it either. Just was your hands as you would after you use the bathroom yourself or clean the litter box and you will be just fine. Bottom line is that animal feces of any species has things in it that would not be healthy for you if they contaminated your food.
