Can you give me a brief summary of Chapter 15 of Contagion by Robin Cook?
Chapter 15 begins lightly with Jack and Chet meeting Terese and Colleen for dinner. Afterward, Chet and Colleen opt for dancing at a nightclub while both Terese and Jack decline the smoke and music filled air of loud nightclubbing. At the curb, Terese convinces Jack to accompany her to her Madison Avenue office to give her his opinion of the new ad campaign that includes Hippocrates making an award to National Health hospital for obeying the Hippocratic Oath by "doing no harm" medically. Terese uses their office visit to get a reciprocal visit to Jack's office in the Medical Examiner's building.
While there (and while Jack is freely talking about the cases without regard to procedural caution) and with Teresa within hearing distance, Janice tells him that the reference lab--a facility for hazardous infectious microbe testing--has confirmed the test results for the rare infectious disease tularemia.
Two things come from this news. The first is that Jack makes a phone report to Calvin who orders silence from Jack and prevention of information leaks while stating that Bingham then the Commissioner of Health will be notified by himself first thing in the morning.
The second thing that comes from this is that Terese begins to insist that the public needs to know about the tests results and that at the very least Manhattan General needs to know in order to make correct treatment decisions for the patients with "febrile" symptomatology.
Calvin's remarks underscore the ongoing conflict between Jack and procedural system he works within. In addition, Terese's insistence sets up a new external conflict for Jack that we expect to develop as the story unfolds.
"What if I alerted the press?" Terese asked.
"I'll have to ask you not to do that," Jack said. "You heard what my boss said. If it were investigated, the source would come back to me."
"You don't like advertising in medicine and I don't like politics in medicine," Terese.