CC,
I know that garlic boosts the immune system, so it's good for you to take it (and for baby too) but the difference in the results is more likely because the NHS has - and I hope I'm remembering this right? - as high as a 50% false negative rate. So, the second time you were tested - was it a high vaginal swab they used to test you again? This is the test that's not very reliable, I'm afraid. Did they explain that the second test might give a false negative? It's so unreliable, I don't know why they bothered giving it to you again
Also, have they discussed giving you intra-muscular injections which are known to work (rather than intravenously during labour)? It's an option to consider.
A much more reliable test for Group B strep is the ECM (enriched culture medium) test. This can be conducted privately by The Doctors Laboratory in London, if you haven't yet had this done on the NHS? They have a two day turnaround for the test (and I think they can do it by post) if you want to double-check the accuracy of your latest NHS test for your own peace of mind? Their website is:
http://www.tdlpathology.com/index.php?option=com_frontpage&Itemid=1
and if you go to the 'A-Z Test Index', the test you need is under 'G' (group B strep).
And remember that although a high percentage of the population have Group B Strep (and a lot of women carry it in their vagina without knowing and pass it on to their babies), only a very small percentage of babies who get GBS will be affected by it. The consequences of the baby being affected can, however, be extremely serious and so although the risk is small, it's probably not one you wish to take a gamble on.
Wendy
P.S. The test packs are free and the postal service (to get your results) from The Doctors Laboratory costs £32. Their 'phone number is 020 7307 7373.