Whithin 24 hours you have an exposure, then you have a period of time for infection and then seroconversion. This doesn't happen over night. In the early period you body has not multiplied enough of the virus to causes transmission.
Teak. one more time i promise. why would this not be possible?
This was already answered.
Teak already said No.
If you want other peoples insights i'd agree with him, it would probably take longer than that for the virus to replicate enough to become effectively transmissable.