What happens on Camazotz when someone gets sick in the book A Wrinkle Time?

In Madeleine L'Engle's "A Wrinkle in Time," when someone gets sick on Camazotz, they are immediately "cured" by the Black Thing. The Black Thing is an entity that controls Camazotz and seeks to eliminate individuality and free will.

Here's what happens:

* The Black Thing erases sickness and pain: The Black Thing has the power to instantly "cure" any physical ailment, removing all pain and discomfort. This might seem appealing at first, but it comes at a terrible cost.

* It eliminates individuality and free will: By erasing pain and sickness, the Black Thing also erases a person's ability to experience life in its full complexity. It takes away their ability to feel emotions, make choices, and be unique.

* It makes everyone the same: The Black Thing forces everyone on Camazotz to think and act alike. This creates a society of perfect uniformity, but without any true joy, love, or individuality.

The "cure" on Camazotz is a chilling example of how control and conformity can be achieved by removing the very things that make us human.