It's in part 3 of the book
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Upon leaving the monkey building special chemicals were used to decontaminate individuals. Upon entering the monkey building these individuals would have changed into special clothing that resembled space suits. Note, these chemicals were so strong that the workers were forced to memorize their security codes; cards would have been burned and melted by the chemicals.
The Hot Zone
They were hosed down with fire
they were sent to the crematoria