Objective To construct a scenario expression model reflecting the objective state of unconventional healthcare-associated infection outbreak events, providing a basis for hospital decision-makers to formulate targeted prevention and control strategies.

Methods On the basis of the "triangular" framework of public safety and the theory of disaster science, the components of scenarios of unconventional healthcare-associated infection outbreak events were classified, and the theoretical method of knowledge elements was used to structurally express each component.

Results The scenario components of unconventional healthcare-associated infection outbreak events were classified into disaster-causing factors (DF), disaster-bearing body (DB), disaster-prone environment (DE), and emergency activities (EA). The spatial and temporal expression models of unconventional healthcare-associated infection outbreak events were constructed according to the binary form of knowledge elements, and some scenarios of the events were expressed as examples. Finally, the five-dimensional scenario expression model of unconventional healthcare-associated infection outbreak events was proposed, consisting of component (K), denotation (N), feature (P), value (D), and time (T) dimensions.

Conclusions The cross-domain application of the method of knowledge elements provides an innovative model demonstration for unconventional healthcare-associated infection outbreak events, which is of great significance for improving the preparedness for healthcare-associated infection emergencies.