ET, thanks; it is indeed very disturbing. We need to know which variant.
SA, yes; one possibility is that infection could have occurred from one of the travellers luggage during their quarantine period. And yes, similar outliers have been seen from early on. Also, persistence of infection beyond nominal recovery has been detected in intestinal cells and neurons.
We should NOT underestimate this virus. It keeps surprising us and we have no way of knowing what the next surprise may be. We should do our utmost to eradicate it.