Donât purchase cracked eggs; bacteria can enter eggs through cracks in the shell. â Make sure the eggs have been refrigerated in the store; bacteria can multiply quickly when eggs are left at room temperature. â If you are purchasing egg products or substitutes, check to make sure containers are well sealed.onât purchase cracked eggs; bacteria can enter eggs through cracks in the shell. â Make sure the eggs have been refrigerated in the store; bacteria can multiply quickly when eggs are left at room temperature. â If you are purchasing egg products or substitutes, check to make sure containers are well sealed.