Here is a link I found to an essay on GBS...I think it gives a pretty good explanation, and also has links to other info.
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http://womynwisespeaks.wordpress.com/informed-choice/group-b-strep/
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I've also seen some explanations by different mws about using hibiclense to get a negative test: use 1 part hibiclense to 20 parts water (assuming you buy what is commonly sold at pharmacies, a 4% hibiclense solution--the idea is to make the solution into a .2% strength--2/10s of 1%-- so it will be strong enough to kill gbs, but not so strong as to burn your mucus membranes.) You use it to do a low douche/high rinse (and wash off the perineum and anus too) just before doing the gbs swab.
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As for the difference between baby being born with the infection, and not getting sick for a few days: it seems that it depends on when baby was exposed. So maybe water was broken for more than a day or so, gbs could have gotten into the amniotic fluid and started growing enough to make baby sick by the time of birth. Or, baby wasn't exposed until actually being born, and it takes a few days for gbs to incubate and cause infection. One also has to consider that gbs lives in our environment--so a baby with a later-starting infection could have been exposed AFTER birth, from something/someone in the environment. Anyway, the above essay might be helpful, along with some of the links to info.
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GBS isn't something I worry about, per se. I do have a concern for having a negative test, just in case of transfer! I know a couple families who had endless hassles over 'unknown gbs status' on transfer (treated as if positive). And others who tested (making sure to get a negative) and when they could show the 'negative status' to the hospital staff, a lot of testing/treatment was avoided. Not to mention (shall I harp on this one more time???) that it made them look better to staff that they tested at all.