I'm planning to rent a car in JNB and drive up to Victoria Falls (Zambia) through Botswana. Then drive back to SA at JNB airport.
I've just noticed South African authorities may ask for a Yellow fever certificate of vaccination, which I don't have.
And this would mess up my plans.
Is this required also for tourists which have no direct entry Zambia-->S.A., as is my case going to Botswana before?

I would not take any risk to be rejected at land border, or quarantined, hence before changing destination an insider hint is much appreciated.
Thanks.