How was Law's fever cured by eating Ope Ope fruit?


I saw the episode in which Law had a fever and was about to die.

Just by eating the Ope Ope fruit his fever was cured.

As I understood, it makes you a genius doctor, but how was he cured instantly?




Eating Ope Ope no Mi does not guarantee a **cure** _per se_. Remember the
scene when Law tried to heal Rosinante? Rosinante **_laughed_** at him and
said it doesn't work that way. Ope Ope no Mi is simply a tool/means to heal
someone.

Law had to **study** being a doctor and medicine to cure himself with said
**knowledge**.

As the wiki has said,

> The Ope Ope no Mi is a Paramecia-type Devil Fruit that allows its user to
> create a spherical space or "room", in which the user has **complete
> control** over the placement and orientation of the objects inside, making
> the user a Free Modification Human (改造自在人間 Kaizō Jizai Ningen?).

Like the description has said, the Ope Ope no Mi is indeed a powerful devil
fruit but more powerful if the user has **medical knowledge**.

> The Ope Ope no Mi has been described as having " **miraculous** "
> properties, having the _ability to cure any kind of illness_ , but at the
> same time still **requires some extent of medical knowledge in order to be
> utilized effectively** as the fruit's influence only **bends** but **not
> fully defy** biological aspects of those recipient to its life-saving
> applications and its miraculous healing is actually **focused on spatially
> extracting disease-causing impurities such as bacteria and viruses directly
> out of the patients' bodies**. As such, if a _doctor of prodigious_
> **medical expertise** were to obtain this fruit's power, their medical
> abilities would be second to none.

