At the Edge of Modern Medicine: Dr. J. Katherine Pronty and the Side-Chain Theory of Immunity
Updated: 4 days ago
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In 1915, a Black woman physician stood before a Wheeling audience and explained one of the newest and most consequential theories in medical science.
On Sunday evening, March 21, 1915, Simpson Methodist Episcopal Church in Wheeling hosted the opening program of a week devoted to public health.
The evening included music, an invocation and a formal welcome from City Solicitor J. Harold Brennan, speaking on behalf of the city. Dr. Harold S. Gloster presided. Over the following days, Wheeling residents would hear from state, county and city health officials on sanitation, food inspection, disease prevention and the responsibilities of public-health agencies.
Among the physicians addressing the opening gathering was Dr. J. Katherine Pronty Davis.
Her subject was remarkable:
“The Side-Chain Theory of Immunity.”
Those words may sound obscure to a modern reader. In 1915, however, they represented something very different. Side-chain theory stood near the frontier of the emerging science of immunology. It was an effort to explain, at the chemical level, how the human body recognizes and defends itself against disease.
Dr. Pronty was not merely offering practical advice about cleanliness or ordinary illness. She was interpreting one of the most important—and still evolving—scientific ideas of her generation.
That would have been noteworthy for any physician practicing in Wheeling.
For a Black woman physician in early twentieth-century Appalachia, it was extraordinary.
A New Science of the Immune System
At the beginning of the twentieth century, scientists were still struggling to understand what immunity actually was.
They knew that exposure to certain diseases could provide future protection. They had seen vaccines work. Physicians were using antitoxins against illnesses such as diphtheria and tetanus. Yet the underlying mechanisms remained uncertain.
How did the body recognize a toxin?
Why could an animal or person become resistant to a particular disease?
What was present in the blood of an immunized patient that could protect another person?
One of the scientists attempting to answer these questions was German physician and researcher Paul Ehrlich. Drawing upon his experiments with dyes, cells, toxins and antitoxins, Ehrlich proposed that living cells contained specialized chemical structures that he called “side chains.”
In simplified terms, Ehrlich imagined these structures as locks capable of receiving particular chemical keys. A toxin could attach itself only to a compatible side chain. When a toxin occupied or damaged those structures, the threatened cell responded by producing more of them. According to the theory, some of the excess side chains then broke away from the cell and circulated through the bloodstream, where they could bind to the invading toxin.
These free-floating protective structures were what scientists were beginning to understand as antibodies.
Modern immunology has revised many of the mechanical details of Ehrlich’s original theory.
Cells do not manufacture antibodies in precisely the manner he envisioned. Nevertheless, his ideas helped establish principles that remain fundamental: immune responses are highly specific, chemical structures recognize and bind to one another, and circulating antibodies can neutralize particular threats.
Side-chain theory was an early ancestor of receptor theory, immunochemistry and the modern understanding of targeted biological treatment.
It helped scientists begin to see immunity not as a mysterious quality possessed by the body, but as a system that could be investigated through chemistry and experimentation.
Only Seven Years After the Nobel Prize
The timing of Dr. Pronty’s lecture is essential to understanding its importance.
In 1908—only seven years before the Wheeling program—Paul Ehrlich shared the Nobel Prize in Physiology or Medicine with Élie Metchnikoff. Their work represented two different but ultimately complementary ways of understanding immunity.
Metchnikoff emphasized the role of specialized cells that engulf and destroy invading organisms, a process called phagocytosis. Ehrlich concentrated on substances circulating in the blood, including antitoxins and antibodies.
One investigated the cellular defenses of the body. The other helped explain its chemical or “humoral” defenses.
By 1915, scientists increasingly recognized that both processes were important.
Immunology was becoming a distinct scientific field, but many of its foundational questions remained unsettled.
Ehrlich was still alive when Dr. Pronty gave her lecture in March. He would die later that same year.
This means that Dr. Pronty was not lecturing about a distant discovery that had long since entered ordinary medical textbooks. She was discussing the work of a living scientist whose theories remained part of an active international conversation.
It was the equivalent of a physician today explaining a newly recognized mechanism in genetics, immunotherapy or vaccine science shortly after it received the world’s highest scientific recognition.
From an International Laboratory to a Wheeling Church
The setting makes the story even more powerful.
Ehrlich’s theory emerged from laboratories and research institutes in Germany. Its development involved some of Europe’s most prominent scientists, new methods of chemical investigation and debates occurring within the young field of bacteriology.
Yet in March 1915, that scientific conversation reached Simpson M.E. Church in Wheeling.
It arrived through the voice of Dr. J. Katherine Pronty Davis.
This was science being translated from the laboratory into the community. Dr. Pronty was helping an audience understand that the human body possessed complex and specific defenses—and that modern medicine was beginning to uncover how those defenses worked.
Her subject also complemented the more immediately practical lectures offered during the evening. Dr. J. T. Sawyer spoke on preventive medicine. Dr. W. A. Wright discussed the prevention of ordinary headaches. Dr. M. A. Morrison addressed the care of the teeth.
Dr. Pronty chose a more theoretical subject. She invited her listeners beneath the visible symptoms of illness and into the microscopic and chemical processes through which the body attempted to protect itself.
That choice tells us something about her intellectual confidence. It also suggests that she believed a community audience was capable of engaging with sophisticated medical ideas.
She did not diminish the science for the setting.
She brought the science to the people.
A Black Woman Physician in 1915 Appalachia
The social significance of this appearance cannot be separated from its scientific importance.
Dr. Pronty entered medical practice during an era when relatively few women became physicians and only a remarkably small number of Black women were able to overcome the combined barriers of race and sex to earn medical degrees.
She had studied at Shaw University and later attended Meharry Medical College, one of the nation’s most important institutions for educating Black physicians. After earning her medical degree in 1910, she established her practice in Wheeling in 1911.
When she delivered the side-chain lecture, she had been practicing in the city for only about four years.
She was still a relatively young physician. Yet there she stood on a public program that included established medical professionals and representatives of city government, entrusted with explaining one of the most advanced medical theories of the age.
This was taking place in a nation governed by Jim Crow segregation.
Black physicians regularly encountered exclusion from hospitals, medical societies, professional networks and postgraduate training opportunities. Black women faced the additional burden of entering a profession that many Americans still regarded as properly belonging to men.
Even successful Black physicians could find their knowledge questioned, their practices restricted and their accomplishments omitted from the official record.
Dr. Pronty’s presence therefore carried meaning before she spoke a single word.
Her lecture declared that a Black woman in Appalachia could possess command of international medical research, interpret contemporary scientific theory and teach it to a public audience.
It challenged prevailing assumptions about who could create, understand and communicate scientific knowledge.
More Than a Lecture
The side-chain theory was not limited to an explanation of antibodies. It helped shape Ehrlich’s larger belief that medicine might create substances capable of seeking out particular disease-causing organisms while producing minimal damage to the patient.
He famously described such treatments as “magic bullets.”
That line of reasoning contributed to the development of chemotherapy—not chemotherapy in only its later cancer-related meaning, but the broader use of specifically designed chemical agents to attack disease within the body. Ehrlich and his colleagues eventually developed Salvarsan, the first widely effective treatment for syphilis and one of the earliest major successes of modern antimicrobial chemotherapy.
The theory Dr. Pronty discussed therefore stood at the intersection of several medical revolutions:
the discovery of antibodies;
the emergence of immunology;
the development of serum therapy;
the chemical targeting of infectious diseases;
and the search for treatments that could attack disease without destroying the patient.
We cannot know precisely how technical her presentation was or which examples she used.
The newspaper preserved the title of her lecture, but not its text.
Even so, the title alone reveals the seriousness of her engagement with modern medicine.
Dr. Pronty understood that health education required more than telling people what to do. It could also mean helping them understand why the body responded as it did and how scientific research was transforming medical treatment.
Public Health, Civic Recognition and the Black Church
Simpson M.E. Church was more than a house of worship. Like many Black churches, it functioned as a center of education, organizing, culture and civic life.
That makes it a fitting location for this lecture.
The program combined spiritual leadership, music, municipal recognition and medical education. City Solicitor Brennan’s welcome signaled official interest in the week’s activities.
The subsequent participation of state, county and city health officials connected the church gathering to the broader machinery of public health.
At the same time, the event demonstrated the capacity of Wheeling’s Black community to create its own spaces for serious intellectual and civic engagement.
The community did not wait for universities, hospitals or professional associations to invite its citizens into the conversation. It used one of its own institutions to bring physicians, public officials, musicians and residents together.
Dr. Pronty’s lecture belonged within that tradition.
She was not simply a guest describing European science. She was a Black physician using scientific knowledge in service to a community that conventional medical institutions too often neglected.
Wheeling Was Not Outside the World of Ideas
Stories about Appalachia are frequently distorted by the assumption that the region was isolated from modern intellectual life.
Dr. Pronty’s lecture tells a different story.
Scientific ideas traveled. They moved from German laboratories to American medical colleges, from medical journals into professional practice, and from a Black woman physician to an audience gathered inside a Wheeling church.
Wheeling’s Black community was participating in that movement of knowledge.
Its members were not standing outside modernity, waiting for scientific advancement to arrive decades later. They were listening to a discussion of immunology while the field itself was still being formed.
This matters because the intellectual history of Black Appalachia has too often been overlooked. Its residents are frequently remembered only through stories of labor, segregation or deprivation. Those histories are essential, but they are not complete.
Black Wheeling also contained physicians, educators, clergy, musicians and civic leaders who followed international developments, built institutions and created opportunities for public learning.
Dr. Pronty was part of that world.
A Remarkable Archival Detail
The newspaper report contains one complication that deserves acknowledgment.
In its list of speakers, The Wheeling Intelligencer printed the name as “Dr. J. E. Pronty.” Later local historical research attributes the lecture to Dr. J. Katherine Pronty, the Black woman physician practicing in Wheeling at the time. No separate Wheeling physician matching the printed initials has been established in the available research.
The newspaper may have misread, abbreviated or incorrectly typeset her initials—a common problem in period newspapers. The identification is strongly supported by the local professional context and subsequent historical work, but the discrepancy should remain visible in the record rather than be silently erased.
Historical integrity requires both conclusions and caution.
Accordingly, this installment follows the identification of the speaker as Dr. J. Katherine Pronty Davis while preserving the newspaper’s original rendering in the source record.
A Voice at the Frontier
Dr. Pronty’s lecture gives us only a brief glimpse of one evening in 1915. No transcript appears to have survived. We cannot hear her cadence, recover her explanations or know how her audience responded.
But what remains is still powerful.
A Black woman physician, practicing in an Appalachian city during the age of Jim Crow, stood before her community and spoke about one of the newest theories in medical science.
She connected Wheeling to an international debate about the nature of immunity.
She treated her audience as intellectually capable.
She transformed a church into a classroom of modern medicine.
And she demonstrated that the history of science in Wheeling cannot be told only through its hospitals, universities and prominent white physicians. It must also include the people who carried knowledge into communities that the medical establishment too often marginalized.
The side-chain theory would be revised. Immunology would advance far beyond what even Paul Ehrlich could see in 1915. Antibodies would be studied at the molecular level, vaccines would become more sophisticated, and targeted therapies would transform entire fields of medicine.
Yet the central idea Dr. Pronty brought to Wheeling—that the body could recognize a particular threat and produce a specific defense against it—would remain one of the foundations of modern medicine.
Her lecture was timely.
Her presence was groundbreaking.
And more than a century later, the surviving newspaper notice allows us to recognize what her audience witnessed that evening: Dr. J. Katherine Pronty Davis standing at the intersection of science, public service, race, gender and Appalachian history.
Historical Note
The 1915 newspaper described the occasion simply as a “Health Week Celebration.” It should not automatically be identified as part of the later, nationally organized Negro Health Week campaign without additional evidence. Whatever its formal affiliation, the program clearly placed health education within the civic and institutional life of Wheeling’s Black community.
The newspaper printed the lecturer’s name as “Dr. J. E. Pronty.” Local historical scholarship identifies the speaker as Dr. J. Katherine Pronty. This article follows that attribution while retaining the original newspaper wording as an acknowledged archival discrepancy.
-T
Sources and Further Reading
“Health Week Celebration,” The Wheeling Intelligencer, March 22, 1915, p. 14.
Science History Institute, “Paul Ehrlich.”
Stefan H. E. Kaufmann, “Élie Metchnikoff’s and Paul Ehrlich’s Impact on Infection Biology,” Microbes and Infection, vol. 10, nos. 14–15, 2008, pp. 1417–1419.
Nobel Prize Outreach, “The Nobel Prize in Physiology or Medicine 1908.”
Shaw University, historical catalog and alumni records identifying Katherine J. Pronty.
Margaret Vigil-Fowler, research on African American women physicians and the history of American medicine.
Ohio County Public Library and Archiving Wheeling, biographical research concerning Dr. Katherine Pronty and Wheeling’s early African American physicians.
