Recrudescence /(r?`kr?*d?s"sens)/

Re·cru·des·cence

Recrudescence

n.
  1. The state or condition of being recrudescent.
    A recrudescence of barbarism may condemn it [land] to chronic poverty and waste.
    — Duke of Argyll.
  2. Increased severity of a disease after temporary remission. (Med.)