Apple Cider Vinegar (or ACV for short) does have numerous health benefits and supports the immune system. ACV is certainly full of vitamins, minerals and trace elements. It helps to lower the pH level in the stomach, helping digestion and making it a less friendly for harmful pathogens. ACV detoxifies the blood and helps remove mucous from within the body, this is particularly useful since chickens are particularly prone to respiratory problems and ACV can be of benefit in helping birds to clear their airways. Due to the acid content of ACV, it is an antiseptic. As well as killing germs, it is also a mild antibiotic as well, (that is, it contains bacteria that destroy infectious organisms).
I don't think of ACV as really a wormer although some websites refer to it as having ability to kill intestinal worms.
It works really well on my skin when I get itchy from something in the woods that woould cause me to have poison ivy symptoms. Instant itch relief and blisters disappear in a matter of hours.