[Nancy1999]

Originally Posted by ally173

yes it does; because it's acidic; it breaks down the walls of the giardia; read this Giardia Cyst Contamination in Drinking Water
also you can feed human grade fossil flour or diatomaceous earth to kill parasites internally; read about it Food Grade Diatomaceous Earth Helps Eliminate Worms & Parasites
you can get it from Only Natural Pet All-in-One Flea Remedy | Dog Cat Fleas Control#

Everything is either acidic or alkaline on the pH scale, and that has nothing to do with being a disinfectant. Your first link says, "Vinegar sometimes used as a vegetable wash and may be effective against some microorganisms in water - we have not yet found authoritative data on this application."

Your second and third links talks about DIATOMACEOUS EARTH and fleas and doesn't mention vinegar that I could find.