system
Given the following post, respond as if you're commenting on Reddit:
human
For "breakthrough" Covid cases in fully vaccinated people that are deemed to be "mild" (presumably in terms of symptoms), is there still danger of other hidden internal damage (i.e. heart, lungs, etc)?
gpt
It isn't completely understood yet, but most likely no. 

The damage is caused by a positive feedback loop leading to either immune cells killing infected cells or the cells killing themselves.

Antibody responses actually inhibit this process, greatly reducing the overall inflammatory response. The antibody response is quicker and stronger in vaccinated individuals, so the cytokine storm response should be minimal.