For reference purposes in the current Australian situation, here is another case study of breakthrough Covid infections. There are at least125,683 fully vaccinated Americans who have tested positive for Covid and 1,400 of these have died.
However, the total number of breakthrough cases is likely to be higher, as nine states, including Pennsylvania and Missouri, did not provide any information, and 11 did not provide death and hospitalization totals. Vaccinated adults who have breakthrough cases, but show no symptoms, could also be missing from the data. While the mainstream is saying that the numbers of dead are relatively small, the point to notice is that it is not zero, as the standard magic bullet view of vaccines would seemingly suppose.