What is the climax of the book On the Road?

Theof the novel is Dean
and Sal's wild excursion to Mexico City. It seems like they have found something alive and vital
there. Sal says, "We wandered in a frenzy and in a dream." All of Mexico seems full of
the kind of life and bohemianthat they have been searching for, and they abandon themselves to
find its pleasures and secrets, such as the "closet-size bars" that line the streets.
Sal remarks on the way that the street life in Mexico never stops and the way in which no one he
sees around him is inhibited. It seems like they have reached the zenith of the bohemian, free
life they are seeking.

However, Sal suddenly develops a fever and
becomes...