That was actually the response of strong healthy immune systems going haywire and actually killing the host ( cytokine storm)
Whoever designed this one inserted HIV which actually takes down the immune system. While this might save the young and healthy in the short run, it may leave them with lasting repercussions, tbd, and much less immune stamina to fight off subsequent reinfections
This. Thank you for saying better than I can.
Much we don't know about this yet.