By Anthony S. Fauci, M.D.

As I prepare to step down from my dual positions at the National Institute of Allergy and Infectious Diseases (NIAID), where I have been a physician-scientist for 54 years and the director for 38 years, a bit of reflection is inevitable. As I think back over my career, what stands out most is the striking evolution of the field of infectious diseases and the changing perception of the importance and relevance of the field by both the academic community and the public.

I completed my residency training in internal medicine in 1968 and decided to undertake a 3-year combined fellowship in infectious diseases and clinical immunology at NIAID. Unbeknownst to me as a young physician, certain scholars and pundits in the 1960s were opining that with the advent of highly effective vaccines for many childhood diseases and a growing array of antibiotics, the threat of infectious diseases — and perhaps, with it, the need for infectious-disease specialists — was fast disappearing.1 Despite my passion for the field I was entering, I might have reconsidered my choice of a subspecialty had I known of this skepticism about the discipline’s future. Of course, at the time, malaria, tuberculosis, and other diseases of low- and middle-income countries were killing millions of people per year. Oblivious to this inherent contradiction, I happily pursued my clinical and research interests in host defenses and infectious diseases.

When I was several years out of my fellowship, I was somewhat taken aback when Dr. Robert Petersdorf, an icon in the field of infectious diseases, published a provocative article in the Journal suggesting that infectious diseases as a subspecialty of internal medicine was fading into oblivion.2 In an article entitled “The Doctors’ Dilemma,” he wrote regarding the number of young physicians entering training in the various internal medicine subspecialties, “Even with my great personal loyalties to infectious disease, I cannot conceive a need for 309 more infectious-disease experts unless they spend their time culturing each other.”

Of course, we all aspire to be part of a dynamic field. Was my chosen field now static? Dr. Petersdorf (who would become my friend and part-time mentor as we and others coedited Harrison’s Principles of Internal Medicine) gave voice to a common viewpoint that lacked a full appreciation of the truly dynamic nature of infectious diseases, especially regarding the potential for newly emerging and reemerging infections. In the 1960s and 1970s, most physicians were aware of the possibility of pandemics, in light of the familiar precedent of the historic influenza pandemic of 1918, as well as the more recent influenza pandemics of 1957 and 1968. However, the emergence of a truly new infectious disease that could dramatically affect society was still a purely hypothetical concept.

That all changed in the summer of 1981 with the recognition of the first cases of what would become known as AIDS. The global impact of this disease is staggering: since the start of the pandemic, more than 84 million people have been infected with HIV, the virus that causes AIDS, of whom 40 million have died. In 2021 alone, 650,000 people died from AIDS-related conditions, and 1.5 million were newly infected. Today, more than 38 million people are living with HIV.

Although a safe and effective HIV vaccine has not yet been developed, scientific advances led to the development of highly effective antiretroviral drugs that have transformed HIV infection from an almost-always-fatal disease to a manageable chronic disease associated with a nearly normal life expectancy. Given the lack of global equity in the accessibility of these lifesaving drugs, HIV/AIDS continues, exacting a terrible toll in morbidity and mortality, 41 years after it was first recognized.

If there is any silver lining to the emergence of HIV/AIDS, it is that the disease sharply increased interest in infectious diseases among young people entering the field of medicine. Indeed, with the emergence of HIV/AIDS, we sorely needed those 309 infectious-disease trainees that Dr. Petersdorf was concerned about — and many more. To his credit, years after his article was published, Dr. Petersdorf readily admitted that he had not fully appreciated the potential impact of emerging infections and became something of a cheerleader for young physicians to pursue careers in infectious diseases and specifically in HIV/AIDS practice and research

Of course, the threat and reality of emerging infections did not stop with HIV/AIDS. During my tenure as NIAID director, we were challenged with the emergence or reemergence of numerous infectious diseases with varying degrees of regional or global impact (see timeline). Included among these were the first known human cases of H5N1 and H7N9 influenza; the first pandemic of the 21st century (in 2009) caused by H1N1 influenza; multiple outbreaks of Ebola in Africa; Zika in the Americas; severe acute respiratory syndrome (SARS) caused by a novel coronavirus; Middle East respiratory syndrome (MERS) caused by another emergent coronavirus; and of course Covid-19, the loudest wake-up call in more than a century to our vulnerability to outbreaks of emerging infectious diseases.

Link to full article in The New England Journal of Medicine

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