I think the most important part of the protocol above is this:
Remember you want to BE GBS negative, not just test negative. So if you try any remedies to avoid GBS you must continue to do so until your baby comes.
I'm all in favor of systemic support, probiotics and other daily routines to ensure the best gut flora and health possible for mama and babe, but I get twitchy with suggestions that are aimed more specifically at faking out the test. I'm not saying that anyone here is trying to "just" fake out the test of course! But it sometimes seems like a fine line to walk, you know?
I take probiotics, vitamin C (in the form of cranberry caplets), vitamin D, and a calcium/magnesium/zinc supplement every day of the year. During pregnancy I add a general prenatal and towards the end of pregnancy EPO. I also am pretty aggresive in treating "ickies" with garlic and sitz baths. But I don't try to do anything "extra" just because of the testing... I want an honest negative so I can relax (I'm in the small % of women who have their water break before labor, and often 12-24 hours before contractions begin so I really want to know my status and so do my attendants!).
~~~~oh, random, but... echinacea can cause increased photosensitivity and it can affect some anesthesia medications. Since pregnancy increases photosensitivity too it's worth being aware of, and if you end up needing medical intervention make sure you tell them you're taking echinacea so they don't give you the wrong medication!~~~~~