This is also happening in our hospital too.To answer your question about testing, I don't think it changes it. If they are incubating, they may have too low of a viral level even with PCR, and it may be a false negative.
The son of a patient tested positive 2 days after he was attending the first consultation of his father.
The colleague of mine who carried out the consultation was not wearing any protective equipment since that happened over 3 weeks ago, when rules were not so strict.
After the son was tested positive my colleague was allowed to work (but had to wear a mask for 10 days), was not tested (since he never developed symptoms) and most probably got away with it.
There seems to be a small window of opportunity for the tests to come back positive and if you test too early or too late you are going to miss it.