What is the best description for the word “lysis”?

Lysis is “the gradual ending of disease symptoms”.
The lysis of the patient’s fever was a positive indication that the treatment was working.
Diagnosis is the process of finding out what is causing symptoms.
The doctor’s diagnosis was that the patient was severely dehydrated and needed fluids.
Prognosis is the predicted outcome of a disease and the chances of recovery.
The doctor’s prognosis for the patient was that they would still be able to live a long and normal life.
Pediculosis is an infestation with lice.
Mrs. Mitchell’s first-grade class has been overtaken with pediculosis. Almost every student has lice.