Infectious diseases reveal medicine at its most dynamic — shaped by evolution, environment, and human behaviour. This chapter lays out the principles that underpin how infections arise, spread, and are controlled.

In this audio deep dive, we explore hosts, pathogens, and transmission without reducing infection to fear or combat. You’ll hear how prevention, diagnosis, and treatment are interwoven — and why antimicrobial resistance is not just a microbiological problem, but a cultural one.

This chapter reframes infection as a systems problem, where biology and society constantly interact.

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