The Question and Answer section for The Hot Zone is a great resource to ask questions, find answers, and discuss the novel.
I'm not sure what you mean by the "nature" of the space suit. The members of the team entering the Level 4 area wear the suits to protect them from infection.
The author reflects on the ease in which a virus like Marburg or Ebola can spread. It is an unsettling feeling he leaves us with. He goes back to the Kitum Cave and the Monkey house to see nature reclaiming the places but this time he wonders if...
From the text:
"The plant reminded Preston of Tartarus, the land of the dead in Virgil's Aeneid,the underworld, where the shades of the dead whispered in the shadows. "