The doctors take blood samples. Chase appears to be taking care of the well baby, and it cries when he jabs it with the needle. "All done! All done," Chase says, a gentle baby-talking tone in his voice. Hot! Foreman gives House the results: the babies tested positive for not one, but three fabulous viruses: Echo (Enteric cytopathic human orphan) virus 11, CMV (Cytomegalovirus), and Parvovirus B19. I'm rooting for Echo, because it sounds cool. The healthy kid, on the other hand, tested positive for both Echo and CMV antibodies. House thinks for a second, and then says he has figured it out: the healthy kid survived because it has its mother's antibodies, making it immune to the virus. All they have to do is test the sick babies' mothers for antibodies. Whatever they don't have out of the three is what is killing their kids.
Blood is drawn. Tests are run. Echo is circled on the whiteboard. All right, Echo! I knew you could do it!
Foreman and Cameron tell Max's parents that their baby has Echo virus 11. Unfortunately, they won't be informing the other sick babies' parents about anything, because then they'd have to pay for some more actors. Foreman says that viruses are harder to treat than bacteria, but that there is an experimental new drug they can try. Cameron contributes by making sympathetic faces. Shut up, Cameron.
Cameron and Chase administer the drug to Max. Max's parents wait outside, helpless and sad. Cameron sees them, and is -- you guessed it! -- sympathetic. This time, though, it actually comes in handy. She walks into the hall and asks the parents if they can help her out: someone has to hold Max while the nurse changes her sheets. We then see Mom and Dad picking up their fussing baby. No wonder this hospital has a problem with deadly virus epidemics: just look how inefficient it is! No way do you need two people to hold one baby! Even the record holder for the heaviest baby ever born was only twenty-two pounds. Not to mention certified hospital personnel should really be taking care of this and -- oh, I see. Letting the parents hold their baby together was a gesture of kindness rather than practicality. Cameron basks in the glow of her good works. Max stops crying and screaming as soon as her parents put her down. She probably would have preferred being held by Chase. Smart baby. Mom and Dad hold hands over their baby, and we can all assume that they won't be getting divorced.
House enters the elevator. He spots Foreman nearby and asks Foreman to take a ride with him. As the elevator makes its descent, House asks how Cameron is doing. "Doctor Cameron?" Foreman asks. No, House wants to know what Camryn Manheim has been doing since her run on The Practice came to an end. House's response is similarly sarcastic. Foreman says that, in his defense, he wasn't expecting House to show concern for another human being. House acknowledges the truth in that, and they bicker back and forth about why House wants to know about Cameron and why Foreman wants to know why House wants to know about Cameron and since when was House curious about trivialities and who said Cameron was a triviality? After all that, Foreman says Cameron is "just fine." "Great. Glad we talked," says House, and enters the clinic. Foreman stands there, all "why do I get stuck with the weirdo boss?" and "great, now I have to take the stairs back up to the fourth floor."