Well we have had very little covid here in Australia (Vic cluster is 30 odd cases), except for a few breakouts from medi hotels, and they seem pretty good with their contact tracing. So if a hybrid resulted from vaccination, then there would be a lot of cases occurring suddenly with no common locations visited, which would raise a lot of eyebrows here very quickly.

Having said that I have no desire to get vaccinated, because we have no idea what this novel RNA may be doing to people, in 1 yr .. 5 yrs because this is untested.