Pathogenesis is a fascinating and ambitious look at how disease has shaped human history. The book connects medicine, empire, trade, and social change in a way that feels both eye-opening and thought-provoking. Kennedy writes in a clear, engaging style, so even the bigger historical arguments stay readable. It’s especially interesting because it pushes you to see pathogens not just as a health issue, but as a major force in the development of societies. Though at times the scope feels very broad, which can cause a bit of fatigue.