If we don't change our strategy, we will face an explosion of cases in the community, mortality will increase, it means sooner or later it will reach the more vulnerable... we will face an explosion of cases which we can not contain or respond to in our health facilities.

Dicky Budiman

The data shows they have the Delta variant( in Kudus) so it is no surprise that the breakthrough infection is higher than before, because, as we know, the majority of healthcare workers in Indonesia got Sinovac, and we still don't know yet how effective it is in the real world against the Delta variant.