Is it possible to get cured when the fever is in the initial stage?

Sure, just pump 'em full of antivirals.

Depends what it is you’re being cured of

Depends on the patient's inclination. Obstinates like me wait till they recover on their own after months together.

if it's viral taberanthe Ibogaine TA (Iboga) would do the trick it cures all known viruses

That depends entirely not on the fever but what's causing it.

People so often deny the fever in its initial stage.

Jungle Fever? 😁😎