The possibility of a smallpox infection was clever, and the medicine was mostly well-done on this week’s House, but the final diagnosis was contradictory and impossible

In 1793, a Dutch slave ship was purposefully sunk off the coast of Bermuda over fears that the cargo and crew were infected with smallpox. Two hundred and seventeen years later, Julies, a sixteen year-old diving on the wreck, brings an old glass jar to the surface. The jar breaks, lacerating her hand, exposing her to the contents of the jar: old scabs. Julie is eventually admitted to House’s service at Princeton-Plainsboro with symptoms of fever, vomiting, and bloodshot eyes. House suspects she has smallpox, so both she and her family are placed in isolation while tests are run. The rest of the team isn’t so sure she has smallpox, suggesting varicella (the virus that causes chicken pox and shingles) or measles as a possibility. Tests are run looking for the three diseases while the family is given smallpox vaccination.
The tests are all negative, but House continues to suspect Julie has smallpox. He hypothesizes that the pressure exposure from her scuba diving has driven the antibodies into her joints, so he has the team drain fluid from her joints to run more tests. While performing the tests, Taub notices a suspicious rash that looks like smallpox alongside Julie’s right knee. A close examination shows no hemorrhagic lesions (which would be a sign of hemorrhagic smallpox, a particularly nasty kind), but a petechial rash is in her right armpit that doesn’t fit the smallpox picture. To House, this new rash means that she does not have smallpox. Meanwhile, the Center for Disease Control (CDC) team this arrives to take over the case and lock down the hospital. The CDC arranges for DNA tests to be run that will confirm or dismiss smallpox once and for all, but it will take eighteen hours to get results. Chase finally arrives and suggests molluscum contagiosum as a possible culprit (sorry, doesn’t match the rash or explain the flu-like symptoms). House still believes it is not smallpox, but he needs proof and the CDC won’t allow him access to the patients. He manages to get a hold of a copy of the captain’s log from the slave ship and pays a Dutch internet stripper to translate it for him. According to the log, only the slaves got sick, not the crew. Given this information, the team proposes a differential diagnosis that includes sickle cell disease, vitamin D deficiency leading to immune suppression with subsequent infection with malaria or dengue fever, or scrofula (an older name tuberculosis infection of the lymph nodes in the neck). House wants to run a TB test, but knows the CDC won’t let him, so he has Foreman pretend he thinks it is meningococcus so he can run the test. As Foreman is trying to smooth talk the CDC doctor, Julie’s step-father develops a severe headache, red eyes, and a nosebleed. This is consistent with smallpox — but according to House it could also represent a brain bleed caused by the tuberculosis. M3 smooth talks the CDC doctors into running a head CT on dad to look for a bleed, but they notice a pustular rash on him and cancel the test since this is consistent with a worsening case of smallpox.
As the day goes on, both Julie and her step-father are worsening. There vital signs are worsening and the rash is spreading. M3 notices that Julie does not have the rash on her soles, while someone with smallpox should. Step-dad does have the rash on his soles — but he also has a history of kidney cancer. House now surmises that the step-father does not have smallpox, but instead disseminated vaccinia — an infection caused by the virus used in the smallpox vaccine (a virus similar to smallpox, but not actually smallpox). It has affected him so severely because his kidney cancer has returned and suppressed his immune system. As proof, House points to the bloody urine at his bedside as proof that his kidney failure (and yes, he said “kidney failure”) was caused by renal cancer and not smallpox. (House does acknowledge, and then promptly ignore, that this none of this explains Julie’s case). House enters the isolation room and injects the step-father with interferon, which should make him better, proving House right. Because he broke quarantine, House finds himself locked in with the patient, likely exposed to whatever the infection is. Unfortunately, the step-father doesn’t get better and actually gets worse. A couple of hours later, after a tearful talk with his wife and son, he dies. It seems we’re back to the diagnosis of smallpox. However, M3 is not ready to admit defeat yet. She has more of the captain’s log translated and discovers that the ship’s cat succumbed to the disease as well — which means it can’t be smallpox as that infects only humans. Hearing that the cat lost all its fur before dying leads her to suspect rickettsialpox, a bacterial disease transmitted by infected mites that live on mice. She has House check the step-father’s corpse for the tell-take eschar (scar) of rickettsialpox, and he finds one. A course of the antibiotic doxycycline and Julie should be as good as new.
As usual, major complaints are in red, minor complaints are in blue, and nit-picking ones in green:
The biggest problem with tonight’s episode is that there’s no way the step-father could have caught rickettsialpox. Even if you accept that the bacteria could live hundreds of years in a glass jar at the bottom of the ocean and could infect someone who got old scab tissue in their blood stream (which seems very questionable to me), Julie could not have passed it on to her step-father as it is not transmitted person to person. Rickettsial pox is only transmitted from the bite of a mite infected with a certain bacteria (and it is this bite that leaves the eschar.) In other words, even if you accept the increasingly ludicrous ideas that 1) Julie caught the infection from the old tissue in the jar, and 2) somehow passed it on to her step-father, even then he couldn’t have had the eschar that proved the case as he was never bitten by an infected mite.
Sigh. Once again, you don’t shock a flatline.
The time course is wrong for smallpox (not a surprise as they commonly shorten time courses on this show, but still worth mentioning). Julie would not have started shedding the virus until the rash appeared (at least ten days after exposure), so her step-father shouldn’t have started showing smallpox symptoms until ten or more days after that.
Again, bloody urine does not equal kidney failure. (House’s point about the color was that a brown color meant the bleeding was before the kidneys filtered the blood, whereas a bright red color meant that the bleeding occurred in the kidneys).
Interferon has been shown, at least in animal models, to treat vaccinia. But it is not a single shot treatment — just like last week it takes several doses to have an effect. It’s not the first line treatment for disseminated vaccinia either, VIG (varicella immune globulin) still is.
The characters were confusing vesicles and pustules. Smallpox has both, but the terms aren’t interchangeable.
What sort of TB test did House want to run? Was he planning on having Foreman place a PPD, which takes 48-72 hours to get a result?
Step-Dad has kidney cancer severe enough to cause immune deficiency, but no other symptoms (except maybe the bloody urine?)
I know Step-Dad was (allegedly) immune compromised, but that was still awfully fast for step-dad to die. First signs of infection to death in less than 18 hours?
The medical mystery was intriguing this week. I like the idea of a smallpox, and the potential route exposure was not impossible (Civil War era smallpox scabs were discovered in an envelope hidden in a book several years ago). I give it an A-. The final solution of rickettsialpox was, for reasons I outlined above, impossible. It score an F. The medicine was fairly well done throughout, though the team never got a good exam on the patient which would have answered a lot of questions (for a legitimate reason this week). I give the overall medical aspect a B-. The soap opera was better this week: more Wilson, better House/Cuddy, and M3 was actually an enjoyable character — if only she had been written this way last week. I give the soap opera a B.
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