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Like many other kids, I had already decided my future at the mature age of 5. Because I liked animals, I was going to be a veterinarian. Unlike most kids, I did not change my mind as I grew up, and 19 years later, I graduated with a veterinary degree from the University of Buenos Aires, Argentina. I opened a small practice in a semirural town near Buenos Aires. However, my practice was not as exciting as my childhood dreams. My days were filled with giving vaccine shots, rehydrating dogs suffering from parvovirus or distemper (most of which died), and performing the spine-chilling job of removing fly maggots from open wounds in the hot summer months. About 4 years into the profession, I decided that being a veterinarian bored me and that what really interested me was not to give vaccine shots but to find out how pathogens produced diseases and how vaccines prevented them. I learned that my veterinary school had just appointed a new professor of immunology, Marta Braun, who was starting a research program in viral immunology and vaccines against foot-and-mouth-disease virus in cattle. I knocked on Marta’s office door and told her that I was interested in doing research. Even though I had no research experience, I was lucky that she liked me and offered me a position as a teaching and research assistant. I took the risk, sold my practice, and from then on, my professional life centered on research in viral immunology. A couple of years later, Argentina reached the staggering annual inflation rate of approximately 3,000% (yes, 3,000!). Because the economic situation was so dire, my wife Norma and I decided to try finding a place abroad where I could do a PhD, hoping that, in the interim, the situation in Argentina would improve. Friends of Marta at the University of Nebraska recommended me to Dwane Wylie, an associate professor of immunology. For reasons I still do not know, Dwane decided to sponsor me to enter the PhD program and hired me as a research assistant without ever meeting me. I moved to Nebraska with Norma in July 1990 without having ever been there and started my PhD in September. Dwane gave me incredible freedom to pursue my interests. A great new discovery at the time was that CD8 T cells recognized viral antigen as peptides bound to a groove inside major histocompatibility complex (MHC) class I molecules. I found this fascinating and decided to focus my dissertation on understanding how influenza virus peptides interacted with MHC I, which was only obliquely related to Dwane’s own current interests. This brought me right into the field of antigen presentation. As I was finishing my PhD in 1994, I wrote many letters (snail mail at the time) requesting postdoctoral positions to the big shots in antigen presentation. I was lucky that one of them, Kenneth Rock, then at the Dana Farber Cancer Institute and Harvard Medical School, answered and invited me for an interview. Ken liked me and offered me a position on the spot. A main interest in Ken’s lab was cross-presentation, a process whereby dendritic cells and macrophages take up exogenous antigens and present their peptides with their own MHC

With some risk-taking and luck: A veterinarian’s adventures in viral immunology