Transient minimal blood in stool is worrisome but is by no means diagnostic of cocci or any other pathogen. If these were stressed birds with early active cocci I doubt ACV alone would knock it down. Can't say that for sure but even the most effective drugs take a little while and the birds are still sick and stressed.
The immunity issue is a totally different kettle of worms. It will take exposure to an infectious agent in some form to stimulate developement of immunity. It makes sense that ACV and other agents that prevent active infection give just enough protection to allow birds to develope immunity by being exposed but not actively infected. As stated in a prior post proving these things would require carefull double blinded studies.
I use ACV all the time in all my waterers. So far so good so I will continue.
The immunity issue is a totally different kettle of worms. It will take exposure to an infectious agent in some form to stimulate developement of immunity. It makes sense that ACV and other agents that prevent active infection give just enough protection to allow birds to develope immunity by being exposed but not actively infected. As stated in a prior post proving these things would require carefull double blinded studies.
I use ACV all the time in all my waterers. So far so good so I will continue.