Chapter 6 "Wednesday 4:05 P.M., March 20, 1996" takes a step back from Jack and provides a different point of view on the situation. This means that the narrative focus switches from Jack's perceptions and experience to that of Susanne Hard.
The third-person limited narrator tells us that patient Susanne Hard is being ambulatory (i.e., walking after surgery) and observing the comings and goings of masked hospital personnel. She has been a hospital patient often enough to know that this is not a normal state of affairs.
What had caught [Susanne's] attention in the elevator lobby was the disturbing amount of traffic coming in and out of the medical ward as well as .... most of the people wearing masks.
She is suddenly hit by unexpected, strange and severe symptoms and as quickly as she can returns to her room. Barely able to summon the nurse, it is discovered that Susanne has a extraordinarily high fever, which the nurse lies about and calls "a little one," of 106 degrees.