I'm always interested in this because of my experience.

In the UK they don't test gor GBS because the test is unreliable and the infection can come and go. Instead they administer AB's if the waters have been broken more than 18 hours before the birth. Some babies still get GBS (though all those who i know were induced and AROM was done at some point) and some still die of it.

When i was in labour my midwives checked m went to see the paed before coming back to me and said "her waters broken at 3am, she's still labouring, she's booked for home, they both look good...?" and he gave them PILLS, yes, oral AB's to take! And he was not at ALL worried about us. So i do wonder how much of the IV AB push is about convenience (no drug trolley or supervision) than necessity.

I was to begin taking AB's at 9pm, but i delivered at 6.20pm. DD was fine.

Bx