Abstract Faced with infectious disease threats, the global pork industry and the state have prioritised biosecurity in order to maintain porcine proliferation. Techniques such as good sanitation and surveillance are deemed necessary to ensure animal health. Rooted in germ theory, biosecurity regards disease as an incursion of pathogens from the outside. By drawing distinctions between healthy and diseased bodies, biosecurity regimes appear to represent an anthropocentric desire to control life through spatial enclosure. However, recent work on health geographies has revealed that health is a multifaceted configuration of changing relationships that often escape the purview of biosecurity. Critical studies have pointed out that the management of animal health relies less on any uniform understanding of disease and more on situated veterinary knowledge. This paper seeks to extend this body of work by emphasising inter‐species bodily encounters and earthly elements of the weather‐world. To elucidate this, I draw on recent research into atmosphere and affect, thereby developing the idea of pathological atmospheres. With reference to ethnographical work conducted in veterinary laboratories and commercial pig farms in Taiwan, I point out that a vet's situated expertise is conditioned by their ability to sense and respond to the atmospheric milieu in which they are immersed.
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