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Season 1 · Episode 5

It’s On The Syphilis

23:27Updated November 10, 2026

How do Hollywood summer blockbuster movies connect to sexually-transmitted syphilis? Take a journey from Jurassic Park and Contagion to Oscar Awards, Ignaz Semmelweis and handwashing, Treponema pallidum and syphilis, the No Nose Club, and the infamous Tuskegee Experiment.

0:0023:27
Transcript

In this episode

Mounted Dilophosaurus fossil skeleton showing the skull, vertebral column, and limb bones

Dilophosaurus

© Eduard Solà, CC BY-SA 3.0
Grayscale micrograph of spiral, corkscrew-shaped Treponema pallidum bacteria

Treponema pallidum

© David Cox, public domain

Could, and Should#

When Jurassic Park opened in 1993 it was less a movie than a weather system. It won three Academy Awards, it was sold as an adventure sixty-five million years in the making, and for a while you could not get a haircut without the person holding the scissors talking to you about DNA. It put genetic engineering into ordinary conversation, and it handed the culture two lines it never gave back. One was Jeff Goldblum’s mathematician insisting that life finds a way. The other was his warning that the park’s scientists had been so consumed by whether they could bring dinosaurs back that nobody stopped to ask whether they should. That gap, between can and ought, is the real subject of this episode. The trail from a dinosaur blockbuster to a corkscrew-shaped bacterium runs through a diseased Ice Age bear, a doctor destroyed for being right, and the darkest chapter in the history of American public health, and the whole way down it is asking the same uncomfortable question.

The Bear#

Start with the bear. In 1987, the paleopathologist Bruce Rothschild reported in Nature that the bones of a Pleistocene bear from Indiana, roughly eleven and a half thousand years old, carried lesions characteristic of treponemal disease and tested positive with the same antisera the CDC used to confirm syphilis. Another researcher contested the diagnosis. Rothschild allowed that the animal might instead have had syphilis’s close cousin yaws.

The diagnosis sits on top of a genuinely unsettled question. Treponema pallidum, the bacterium behind syphilis, comes in subspecies that cause yaws and other diseases too, and where venereal syphilis itself came from is still argued. The best-known idea, the Columbian theory, holds that Columbus’s crews carried it back from the New World in the 1490s, just before it exploded across a war-torn Europe. Recent ancient-DNA work on treponemal bacteria from the Americas points toward an American origin, though the debate is not closed. The disease even got its name from a poem: in 1530 the Italian physician Girolamo Fracastoro wrote of a shepherd named Syphilus, cursed by Apollo with the affliction. We can read disease in eleven-thousand-year-old bone and still not agree on where it started, which is a good reminder that detecting a disease and knowing what to do about it are entirely different problems. Nobody learned that more bitterly than the man who discovered handwashing.

The Savior of Mothers#

In the 1840s, a Hungarian physician named Ignaz Semmelweis was working at the Vienna General Hospital, which ran two maternity clinics. One was staffed by doctors and medical students, the other by midwives, and the doctors’ clinic killed far more mothers, sometimes several times as many, with childbed fever, the bacterial infection that followed birth. Semmelweis was haunted by the discrepancy. He noticed that women who gave birth in the street on the way in fared better than those delivered by physicians, and that the midwives’ clinic was safer too. He stripped away every difference he could think of until one remained: the doctors and students went straight from performing autopsies to delivering babies. He concluded they were carrying something he called cadaverous particles from the dead to the living, and in 1847 he ordered them to scrub their hands in a chlorinated lime solution. The maternal death rate in his clinic collapsed, from an average of about ten percent to about two.

He was right, and it ruined him. This was before germ theory, so he could not say what the particles were, only that washing removed them, and the medical establishment already had a long list of fashionable explanations for childbed fever into which his idea did not fit. Worse, many physicians took the implication that their own unwashed hands were killing patients as a personal insult to gentlemen. Semmelweis did not help his case; as the years passed he grew bitter and combative, publishing open letters that called the doctors who ignored him murderers. His behavior deteriorated, and in 1865 his wife and friends had him committed to an asylum. He tried to leave, was beaten by the guards, and died about two weeks later at forty-seven of sepsis from an infected wound, the very kind of infection he had spent his life trying to prevent. There is grim irony layered on irony here, because one of the conditions later proposed to explain his unraveling was syphilis.

The Great Imitator#

Syphilis was, for most of history, almost everywhere. By some nineteenth-century reckonings a startling share of the population carried it at some point in their lives, and the roster of famous people rumored to have had it is long, mostly unprovable, and a parlor game unto itself. The ragtime that scores this episode is part of that story: Scott Joplin, who wrote The Entertainer and Maple Leaf Rag, declined and died of complications generally attributed to the disease, and composers from Schubert to Beethoven turn up on the same speculative lists, with the emphasis on speculative. What is not in doubt is how common and how protean the disease was, which earned it the nickname the great imitator, because its symptoms mimic so many other illnesses.

The culprit is Treponema pallidum, a spirochete, a bacterium shaped like a corkscrew, and it moves like one too, its internal flagella spinning it forward so it can bore through the smallest micro-tears in skin. It usually spreads through sex, and a mother can pass it to her child in the womb, which is called congenital syphilis. Untreated, it unfolds in four acts. First, a few weeks after infection, usually three to four, a chancre appears at the entry point, a firm, round, painless ulcer. Then, weeks to months later, comes a rash that famously turns up on the palms and soles, along with fever and aches. Then a silent latent phase that can last years. And finally, in perhaps a third of untreated people and sometimes decades later, tertiary syphilis, which is no longer contagious but quietly wrecks the organs it has settled into: the brain in neurosyphilis, the heart and blood vessels, the bones. It could be disfiguring enough to collapse the bridge of the nose, which is the grim origin of the so-called no-nose clubs, which appear in satirical London writing and later retellings as dinners for the disfigured; how real they were is hard to say. And then, since the 1940s, the twist that makes the rest of this story unbearable: a few injections of penicillin cure it. We could fix it.

What We Did Instead#

For forty years, the United States government chose not to. From 1932 to 1972, the U.S. Public Health Service ran what it called the Tuskegee Study of Untreated Syphilis in the Negro Male, in Macon County, Alabama. It enrolled about six hundred poor Black sharecroppers, three hundred ninety-nine of them already infected with latent syphilis and two hundred one as uninfected controls. The men were never told they had syphilis. They were told they were being treated for bad blood, a vague local term, and were given free meals, free exams, and burial insurance in exchange for letting doctors track them. The purpose was simply to watch untreated syphilis run its course to autopsy. When penicillin became the standard cure in the 1940s, the men were not given it. The study ran on for decades more, and it ended in 1972 only because a whistleblower took the story to the press. By then, of the original infected men, twenty-eight had died of syphilis outright, about a hundred more of related complications, forty of their wives had been infected, and nineteen of their children had been born with congenital syphilis.

It was not an isolated lapse. The same agency, with at least one of the same physicians involved, had in the 1940s deliberately infected prisoners, soldiers, and psychiatric patients in Guatemala with syphilis, sometimes by injection and sometimes by sending in infected sex workers, to study the disease and its treatment. These were not failures of scientific capability. The science was sound enough to identify the spirochete, chart its stages, and cure it. The failure was the one Goldblum’s character named in a fictional lab a half century later, made real and monstrous: people so fixed on what they could learn that they never stopped to ask whether they should.

The Cost of Could#

So that is the road from a dinosaur movie to a spirochete, and it turns out the dinosaurs were never the point. The point was the warning bolted onto the side of the spectacle. We learned to read treponemal disease in the bones of an Ice Age bear, to name and describe the corkscrew bacterium, to end its four-act tragedy with a cheap injection. None of that was the hard part. The hard part was the question the science could not answer for us, the one about what we owe the people the science is done to. Tuskegee is the answer to why trust in medicine has to be earned rather than assumed, and why it is thinnest in exactly the communities that were once treated as material rather than patients; the distrust it seeded outlived the study by decades and shapes public health to this day. The most important line in a movie about cloning dinosaurs was never about dinosaurs at all. It was the question we keep forgetting to ask before we find out whether we can. It’s on the syphilis, and it was on us.

Corrections to the audio#

The episode audio states a few things that are wrong. The corrections:

Hosts

Sources and Credits
  1. CreditWritten and performed by Dr. Dustin Edwards and Dr. Faith Cox (another site)
  2. MusicLobby Time by Kevin MacLeod (another site)incompetech.comCC BY 4.0
  3. MusicThe Entertainer by Scott Joplin (another site)Free Music ArchivePublic domain
  4. MusicMaple Leaf Rag by Scott Joplin (another site)Free Music ArchivePublic domain
  5. MusicSymphony No. 5 by Ludwig van Beethoven, performed by the Fulda Symphonic Orchestra (another site)EFF Open Audio License v1
  6. ImageTreponema pallidum (another site)David CoxPublic domain
  7. ImageDilophosaurus (another site)Eduard SolàCC BY-SA 3.0
  8. referenceJurassic Park (1993 film) (another site)WikipediaSpielberg's 1993 blockbuster; tagline 'An adventure 65 million years in the making'; won three Academy Awards for visual effects and sound.
  9. referenceTreponemal infection in a Pleistocene bear (another site)Rothschild BM, Turnbull WNature 329:61-62Lesions of treponemal disease in an ~11,500-year-old bear from Indiana, positive with CDC syphilis antisera; earliest detection of treponemal disease by modern methods.
  10. referenceBear provides earliest evidence of syphilis (another site)UPI ArchivesAn 11,500-year-old bear skeleton found by a utility in Indiana tested positive for antigens from the bacteria that cause syphilis; Rothschild said the bear might instead have had yaws, an almost identical disease caused by a strain of the same bacteria.
  11. referenceHow dramatic were the effects of handwashing on maternal mortality observed by Ignaz Semmelweis? (another site)Journal of the Royal Society of Medicine 106(11):459-460 (La Rochelle and Julien, 2013)Average monthly maternal mortality in Vienna's First Obstetrical Clinic was 10.65% before handwashing (introduced June 1847) and 1.98% after.
  12. referenceIgnaz Philip Semmelweis: The Tragic Pioneer of Hand Hygiene (another site)PMCHypothesized 'cadaverous particles' carried from autopsies to mothers; died shortly after a hand injury/infection, ironically from the kind of infection he sought to prevent.
  13. referenceBrief History of Syphilis (Tampa et al.) (another site)Journal of Medicine and Life 7(1):4-10 (2014)Fracastoro's 1530 poem Syphilis sive Morbus Gallicus gave the disease its name (the shepherd Syphilus); the Columbian hypothesis holds that Columbus's fleet brought it from the New World in 1493.
  14. referenceSyphilis (StatPearls) (another site)NCBI Bookshelf / NIHColumbian theory of origin (1490s); the name from Fracastoro's 1530 poem about the shepherd Syphilus; four stages; painless chancre and palms/soles rash; humans the only host.
  15. referenceAbout Syphilis (another site)U.S. CDC (updated 30 Jan 2025)Syphilis develops in stages (primary, secondary, latent, tertiary); sores are usually firm, round and painless; the secondary rash can appear on the palms and soles; tertiary syphilis can occur 10-30 years after infection and affects the heart and blood vessels and the brain and nervous system; congenital syphilis passes from mother to baby in pregnancy.
  16. referenceSyphilis - STI Treatment Guidelines, 2021 (another site)U.S. CDCSyphilis is a systemic disease caused by Treponema pallidum; penicillin G is the preferred drug in all stages.
  17. referenceThe Untreated Syphilis Study at Tuskegee (About/Timeline) (another site)U.S. CDCUSPHS study 1932-1972, Macon County, AL; 399 Black men with late-latent syphilis and 201 controls; no informed consent; treatment withheld even after penicillin became widely available.
  18. referenceThe Untreated Syphilis Study at Tuskegee Timeline (another site)U.S. CDCThe study began with 600 Black men, 399 with syphilis and 201 without; the men were told they were being treated for bad blood and received free medical exams, meals and burial insurance.
  19. referenceFiftieth Anniversary of Uncovering the Tuskegee Syphilis Study (another site)PMCThe same group of researchers deliberately infected hundreds of Guatemalans with syphilis and gonorrhea in the 1940s; records surfaced in 2010.
  20. referenceSyphilis in a Pleistocene bear? (another site)Neiburger EJNature 333:603Disputes Rothschild and Turnbull's treponemal diagnosis: the lesions resemble fungal or tubercular disease, and the antigen test depends on bone left uncontaminated for 11,000 years.
  21. referenceAncient genomes reveal a deep history of Treponema pallidum in the Americas (another site)Barquera R, et al.Nature 640:186-193Five ancient treponemal genomes from the Americas support an American origin for all T. pallidum characterized at the genomic level, modern and ancient.
  22. referenceThe Recurring Issue of Syphilis in Europe: Comment on "Ancient Genomes Reveal a Deep History of Treponema pallidum in the Americas" (another site)Dehmane M, et al.Journal of Infectious DiseasesThe origin of syphilis in Europe remains debated; pre-Columbian genomes and paleopathological evidence of European treponematoses challenge a single transatlantic introduction.
  23. referenceIgnaz Semmelweis: a victim of harassment? (another site)Schreiner SWiener Medizinische Wochenschrift 170:293-302 (2020)Semmelweis called his opponents murderers in open letters; in 1865 relatives, including his wife, took him to a Vienna asylum, where he tried to escape, was badly abused and died of sepsis two weeks later; neurosyphilis has been proposed but is judged unlikely.
  24. referenceDr. Ignaz Phillip Semmelweis: The Unrecognized Pioneer of Aseptic Practices (another site)Dash NR, et al.Cureus 16:e68350 (2024)Admitted to an Austrian asylum by his friend Ferdinand Hebra and his wife; died of septicemia within 14 days from a wound infection after beatings by asylum attendants; some claimed his mental decline was third-stage syphilis.
  25. referenceSyphilis: using modern approaches to understand an old disease (another site)Ho EL, Lukehart SAJournal of Clinical Investigation 121(12):4584-4592 (2011)T. pallidum propels itself with a corkscrew-like motion using endoflagella inside the periplasmic space, and is usually transmitted sexually through microabrasions in mucosal membranes or skin.
  26. referenceSyphilis (another site)Merck Manual Professional VersionA chancre develops after an incubation period of 3 to 4 weeks (range 1 to 13 weeks); about one-third of untreated people develop late syphilis, which is not contagious.
  27. referenceThe Syphilis Pandemic Prior to Penicillin: Origin, Health Issues, Cultural Representation and Ethical Challenges (another site)Ekselius L, Gerdin B, Vahlquist AActa Dermato-Venereologica 104:adv34879 (2024)When the Tuskegee study ended, 28 men had died of syphilis, 100 of syphilis-related complications, 40 of their wives had been infected and 19 of their children had been born with congenital syphilis.
  28. referenceSyphilis (fact sheet) (another site)World Health Organization (29 May 2025)WHO estimates that 8 million adults between 15 and 49 years old acquired syphilis in 2022.
  29. referenceChlamydia, gonorrhoea, trichomoniasis and syphilis: global prevalence and incidence estimates, 2016 (another site)Rowley J, et al.Bulletin of the World Health Organization 97(8):548-562 (2019)WHO's 2016 estimates for adults aged 15-49: 6.3 million new syphilis cases, and prevalence corresponding to 19.9 million cases.
  30. referenceThe gastric disease of Napoleon Bonaparte: brief report for the bicentenary of Napoleon's death on St. Helena in 1821 (another site)Lugli A, et al.Virchows Archiv 479:1055-1060 (2021)The autopsy reports allow a final diagnosis of advanced malignant gastric neoplasia with upper gastrointestinal bleeding as the cause of death; the arsenic hypothesis was dismissed by a 2008 study.
  31. referenceScott Joplin & the Magical “Maple Leaf Rag” (another site)Tucker NLibrary of Congress blog (21 Nov 2024)Joplin was a pianist and composer; Maple Leaf Rag became the signature piece of ragtime, which helped set the foundations for jazz.
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