I'm honestly not sure, but if it would make you feel more at ease, look up the period of time between exposure and when symptoms occur and maybe try to avoid contact for that amount of time?
I've just looked into this because my brother has whooping cough, and was diagnosed just before I had DS2. My SIL came into the hospital to visit me, but my brother stayed at home.
My SIL has been immunised because she is a nurse so she's fully up to date. My brother is on antibiotics - which apparently, stops the spread if you interact with them after the first 5 days of the dose.
I'm immunised for WC (when DD3 was 8 months old) - and the booster lasts for a fair while from what we could find out via google.
Its a scary thing - my mum is going to get her booster shot for WC because she hasn't had one in like, forever lol Just make sure if anyone coughs, they don't cough in the direction of the baby!
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