The Tuskegee Syphilis Study

What the claim says

The Tuskegee Syphilis Study is usually summed up in one sentence: the United States government let hundreds of Black men with syphilis go untreated for forty years so that doctors could watch the disease run its course. The record supports that core. The U.S. Public Health Service (PHS), working with the Tuskegee Institute, followed 600 Black men in Macon County, Alabama from 1932, 399 of them with syphilis and 201 without. The CDC's own history says the researchers obtained no informed consent, told the men they were being treated for "bad blood," and did not offer them treatment, even after penicillin became the treatment of choice.

Retellings add things the record does not contain: that the men were injected with syphilis, that the CIA or the CDC devised the study in secret, that all 600 men were sick, or that Tuskegee proves modern vaccines and clinical trials are hidden experiments of the same kind. The sections below separate what the documents show from those additions.

How the study began

In 1929 the PHS and the Julius Rosenwald Fund began a project in six southern counties, Macon County, Alabama among them, to survey and treat Black men and women with syphilis. As the Great Depression deepened, the PHS and the Rosenwald Fund became increasingly unable to continue funding, and, writes historian Susan Reverby in the Encyclopedia of Alabama, PHS officers saw in that turn of events an opportunity for what is called a "study in nature" of untreated syphilis.

The new study began, as the Rosenwald program had, with treatment. Costs rose as more men presented, and three PHS physicians, Taliaferro Clark, Raymond Vonderlehr and O. C. Wenger, decided to shift to a study of untreated syphilis, modeled on a retrospective study of white men in Oslo, Norway. A letter from Clark to the Rosenwald Fund dated 29 October 1932, cited in the 1973 report of the Tuskegee Syphilis Study Ad Hoc Advisory Panel, described the plan as a short-term study of six months or longer. The panel found that no written protocol documenting the study's original intent existed.

The CDC says the study was limited to Black men aged 25 or older and that no women were included, although some women contracted syphilis from men in the syphilitic group as a result of the lack of treatment. The CDC states that the 399 men in the syphilitic group were recruited because they already had late-latent syphilis, according to a 1936 journal article about the study, and that the 201 men in the control group did not have the disease. In exchange for taking part the men received free medical exams, free meals and burial insurance. Reverby notes that the men were led to believe that the rubs, tonics and aspirins given to them were treatments for "bad blood" and that painful spinal taps were explained as a "back shot." PHS physicians realized that the best data would come from autopsies, so they authorized the study's nurse, Eunice Rivers, to offer $50 to families in exchange for autopsy agreements.

What the men were and were not told

The CDC's timeline says participants' informed consent "was not collected." The Ad Hoc Advisory Panel, a nine-member body appointed in 1972, found "no evidence that informed consent was gained from the human participants in this study." Its report added that the only documentable statement on enrollment was that individuals giving a history of infection who "submitted voluntarily to examination" were included, and drew the conclusion: "Submitting voluntarily is not informed consent."

Treatment: 1932, 1943, the late 1940s and 1953

Whether the men should have been treated depends on the year. In 1932 syphilis was treated with mercury, bismuth, arsphenamine and similar agents, in regimens that could run up to two years and were not without hazard to the patient. Yet the panel recorded that it was "known as early as 1932" that 85 percent of patients treated for late latent syphilis enjoyed prolonged good health, against 35 percent if left untreated, and that treatment schedules for late latent syphilis were published and in use. It also said that a properly designed study of untreated syphilis, with a clear protocol and subjects who fully understood it, "might have been justified in the prepenicillin era" given the uncertain results and the toxic drugs then available.

Penicillin changed the question, but the dates given for that change differ. The CDC's current timeline says that by 1943 penicillin was the treatment of choice for syphilis and becoming widely available, "but the participants in the study were not offered treatment." In Heller's 1972 story Dr. J. D. Millar, the CDC official then in charge of what remained of the study, said that penicillin therapy became available in the late 1940s, and the story itself put wide availability 15 years after the study began. The panel recorded that penicillin was recommended for late latent syphilis in the late 1940s, but treated it as generally available only around 1952 to 1953, and concluded that treatment should have been offered to the participants "not later than 1953." The panel also found "a crucial absence of evidence that patients were given a 'choice' of continuing in the study once penicillin became readily available."

How actively treatment was blocked is documented unevenly. In 1972 Millar stressed that "Patients were not denied drugs"; the Times reported that rather "they were not offered drugs." The panel said reports on the point were varied and "still subject to controversy": it received accounts that treatment was deliberately withheld and others that men seeking treatment were not turned away. What the panel called "clearly documentable" was a series of letters between Vonderlehr and health officials in Tuskegee, running from February 1941 to August 1942. Men from the study had been called up for army duty and rejected because of positive blood tests. The local draft board was given a list of 256 names of men under 45 and asked to exclude them from the list of draftees needing treatment, and the letters say the board agreed so that the study could continue. Panel member Jay Katz, a Yale Law School professor, wrote in a reservation to the report that the investigators assumed the men would never seek treatment and that this assumption led them deliberately to obstruct treatment for some participants. Reverby writes that local doctors were asked to withhold treatment, though how far they complied is uncertain.

The word "untreated" in the study's name was also not literal. The panel cited a 1971 paper reporting that all but one of the originally untreated men seen in 1968 to 1970 had received therapy, although the heavy metals or antibiotics were given for various reasons by non-study physicians and "not necessarily in doses considered curative for syphilis." The panel concluded that most participants received some form of treatment, provided by physicians outside the study, and that the adequacy of that treatment is not known. Reverby adds that some men received penicillin from other providers in the 1950s, probably for other illnesses.

A study published in the open

The study was not hidden from the medical profession. Reverby counts 13 reports published in medical journals between 1936 and 1973, in which the men were sometimes called "volunteers." A 1972 CDC official put the number at 15 and said the study "was never clandestine." The Associated Press wrote in its 2024 obituary of Peter Buxtun that about a dozen articles about the study had been published in the previous 20 years, "But hardly anyone had raised any concerns about how the experiment was being conducted."

At least one insider saw the problem. In 1950 O. C. Wenger, one of the physicians who shaped the study, said, as the panel quoted him, "we have contributed to their ailments and shortened their lives" and "we have a high moral obligation to those that have died to make this the best study possible."

The study was run by the PHS, not by the CDC. The Communicable Disease Center, later the CDC, was created by the PHS in 1946, 14 years after the study began, and Reverby told USA Today that the PHS ran it while the CDC "later was supervising." By 1966, according to the Milbank timeline, the CDC's Venereal Disease Division was leading the study.

On 6 February 1969 a committee convened by the CDC and drawn largely from the medical community met, from 1:00 to 4:10 p.m., to decide whether the study should be terminated or continued. The summary of the meeting recorded that "This type of study would never be repeated," that there were "certain medical facts to be learned" by continuing, and that treatment was not indicated for the men unless they had signs of active syphilis. The Milbank timeline states the panel recommended that the study continue and that the CDC heeded the advice. In 1973 the Ad Hoc Advisory Panel criticized that review: legal representatives and others from the non-medical community "were not adequately represented for so sensitive a study." In 1970, in a memorandum dated 10 September, the Venereal Disease Branch's assistant chief wrote: "Nothing learned will prevent, find, or cure a single case of infectious syphilis."

How it was exposed

Peter Buxtun was a PHS employee in San Francisco tracking venereal disease cases. In 1966 he overheard colleagues discussing the Alabama study, asked the Communicable Disease Center for documents and received a package of reports. The Associated Press says he raised ethical concerns in a 1966 letter to CDC officials and was summoned to a meeting in Atlanta in 1967, where officials rebuffed him. He left the service and went to law school. In 1972 he gave documents to Edith Lederer, an AP reporter he had known since 1968. Lederer handed a manila envelope to her colleague Jean Heller at the 1972 Democratic National Convention in Miami Beach, saying "I think there might be something here."

Heller, then 29 and the only woman on AP's investigative team, found that the government stonewalled her and would not discuss the study, then tracked down an obscure medical journal that had been reporting on its "progress." Her story was datelined 25 July 1972 and ran in The New York Times the next day under the headline "Syphilis Victims in U.S. Study Went Untreated for 40 Years." It opened by saying that for 40 years the Public Health Service had conducted a study in which men with syphilis, "who were induced to serve as guinea pigs, have gone without medical treatment for the disease." Assistant Secretary for Health Merlin K. DuVal expressed shock on learning of the study and said he was making an immediate investigation, and Senator William Proxmire called it "a moral and ethical nightmare."

DuVal appointed the Ad Hoc Advisory Panel in August 1972, with a charter dated 28 August. It had nine members from medicine, law, religion, labor, education, health administration and public affairs, chaired by Broadus N. Butler, president of Dillard University. On 25 October 1972 it recommended that the study "should be terminated immediately." DuVal's memorandum to the CDC director terminating the study is dated 16 November 1972, nearly four months after Heller's story.

What the panel found

The panel's final report was transmitted on 28 April 1973. Its chairman, Butler, wrote that he specifically abstained from concurrence in the report but recognized his responsibility to submit it; on the report on its first charge, two members approved with reservations. The panel concluded that "In retrospect, the Public Health Service Study of Untreated Syphilis in the Male Negro in Macon County, Alabama, was ethically unjustified in 1932," while acknowledging that this was a judgment made "with the advantage of hindsight." It judged the long-term study "scientifically unsound," with results "disproportionately meager compared with known risks to human subjects involved." On penicillin, the panel said withholding it after it became generally available "amplified the injustice" already done to the men.

The panel placed Tuskegee in a wider setting. Its third charge was whether existing research policies protected patients, and it found that "No uniform Departmental policy for the protection of research subjects exists." It said the study, "despite its widespread publicity was not an isolated phenomenon," and recommended that Congress create a permanent body, which it called a National Human Investigation Board, to regulate federally supported human research.

Consequences

Care and benefits. In March 1973 the panel advised HEW to provide all necessary medical care to survivors, and the Tuskegee Health Benefit Program was set up. In 1975 wives, widows and children were added, and in 1995 the program was widened to include health as well as medical benefits. The CDC reports that the last study participant died in January 2004 and the last widow receiving benefits in January 2009, and its page, updated in September 2024, said 10 of the participants' children still received benefits.

Lawsuit. Fred D. Gray was among the lawyers who brought Pollard v. United States in the Middle District of Alabama; the original complaint was filed on 24 July 1973. The CDC says it ended in 1974 with a $10 million out-of-court settlement, divided so that living men from the syphilitic group received $37,500, heirs of deceased syphilitic-group men $15,000, living control-group men $16,000 and heirs of deceased controls $5,000.

No prosecutions. Reverby writes that no one was ever prosecuted for the crimes committed during the study.

Law and ethics. The National Research Act was signed on 12 July 1974. It created an eleven-member National Commission for the Protection of Human Subjects of Biomedical and Behavioral Research and directed the Secretary of Health, Education, and Welfare to require entities applying for grants or contracts for research on human subjects to give assurances that they had established an Institutional Review Board. The Milbank timeline adds that HEW adopted regulations that year requiring informed consent and IRB review of HEW-supported studies. The Commission's Belmont Report, published in the Federal Register for public comment on 18 April 1979, cited Tuskegee as a case where subjects "were deprived of demonstrably effective treatment in order not to interrupt the project, long after such treatment became generally available." Tuskegee was one catalyst among several; the panel itself pointed to other contested experiments of the era.

Apology. On 16 May 1997 President Bill Clinton apologized in the East Room of the White House to the survivors and their families. He said: "The United States government did something that was wrong -- deeply, profoundly, morally wrong," and, "what the United States government did was shameful, and I am sorry." He announced a planning grant for a bioethics center at Tuskegee, which the CDC says became the National Center for Bioethics in Research and Health Care at Tuskegee University, along with steps to involve minority communities in research and to train researchers in bioethics.

Not the same as Guatemala

A common false retelling holds that the men were infected with syphilis. The CDC states that the men were not purposefully infected: they were recruited because they already had late-latent syphilis. The mix-up often comes from a different case. Between 1946 and 1948, U.S.-supported researchers in Guatemala deliberately exposed people to sexually transmitted diseases without their consent. The Presidential Commission for the Study of Bioethical Issues found that this involved the intentional exposure of 1,308 prisoners, soldiers and psychiatric patients to syphilis, gonorrhea or chancroid, and that commercial sex workers were also used to transmit disease. On 1 October 2010 President Barack Obama telephoned Guatemala's president to apologize, and Secretaries Clinton and Sebelius called the research "clearly unethical." The Commission noted the two cases came from the same PHS laboratory, involved some of the same researchers and both deceived subjects, but that the Guatemalan subjects "were deliberately exposed to infections" and were citizens of a foreign country, and the work there "ended long before the work in Tuskegee stopped." Reverby found the Guatemala records in the papers of the physician who led that work, John C. Cutler, while looking for references to Tuskegee; PBS NewsHour reported that Cutler was also involved in the Tuskegee study.

What remains disputed or unknown

The death toll is the least settled number. Heller reported in 1972 that a 1969 review by the CDC's Atlanta center of 276 untreated men found seven had died as a direct result of syphilis, that 154 of the 400 men in the original syphilitic group had died of heart disease officials said was not specifically related to syphilis, and that Millar said this rate matched the control group's. A tally often repeated in reference works, 28 men dead of syphilis and 100 of related complications (128 in all), does not appear in the CDC's current timeline and about pages or in the panel's report, and should be read as an estimate. Reverby's Encyclopedia of Alabama article says only that untreated syphilis shortened the men's lives and caused many, but not all, of their deaths.

The size of the cohort is also fuzzy. The CDC counts 600 men at the start; the Milbank timeline says more than 624 subjects and controls were enrolled; Heller wrote that some men were added to replace men who dropped out, but that the number was unknown. Nor is it established why the study was not stopped sooner. Asked in 1972 about the decision not to give the men penicillin, Millar said: "I doubt that it was a one-man decision."

How the episode is used in later conspiracy talk

Tuskegee is a staple of distrust of public-health bodies. A 2021 USA Today fact check examined a widely shared Facebook post claiming the Tuskegee study "was also conducted by the CDC" and rated it missing context: the PHS ran it, though Reverby said the CDC knew what was going on and let it continue. Marcella Alsan, a Harvard public policy professor who has researched the study, told the paper that all participants in COVID-19 vaccine studies were consenting, informed individuals, unlike the men at Tuskegee.

The mistrust effect itself has been studied. Alsan and Marianne Wanamaker found that disclosure of the study in 1972 was correlated with increases in medical mistrust and mortality and decreases in physician visits among older Black men, with an estimated fall in life expectancy at 45 of up to 1.5 years. The Encyclopedia of Alabama notes that Tuskegee is often cited as the reason many African Americans avoid care or clinical trials, though it is "clearly part of a long history of mistrust."

What is documented, and where the claim outruns it

CDC and HHS histories, ethical reviews, and the Belmont Report context document deception, lack of informed consent, and treatment failures. The 1973 Ad Hoc Advisory Panel, a 1974 settlement and a presidential apology all rest on that record.

The unsupported leap is using Tuskegee to claim that every vaccination campaign, clinical trial, or public-health intervention is a comparable secret experiment. Several other common retellings also go beyond the record: that researchers injected the men with syphilis (they were recruited with the disease already; the deliberate infections were in Guatemala), that all 600 men were infected (201 were controls), that the CIA or the CDC created the study (the PHS did, and published its results), that the men never received any treatment from anyone (many got partial or non-curative treatment from other doctors, though they were never offered the penicillin cure by the study), and that a precise death toll is established (it is not).