Epidemics
How a marble box taught epidemic theory
Open access · cc by · source: Europe PMC
Engelmann shows that the 1920s Reed-Frost epidemic theory, taught with a trough and colored marbles, made epidemics into an academic research object without replacing fieldwork.
Key findings
As epidemiology became an academic department, models supplied a general representation of interdependent contacts, susceptibility and immunity. Frost still insisted that a local measles outbreak could not be understood by abstraction alone. Models taught relations; they were not general laws of the 'epidemic streets'.
Methodology
A historical reconstruction of the Reed-Frost epidemic theory at Johns Hopkins, reading its mathematical assumptions against earlier epidemic formalisms and against how Reed and Frost used a mechanical analogue of marbles in a trough to teach infectious-disease dynamics.
Limitations
This is not a test of COVID models' accuracy, nor a new epidemic simulation. It does not claim that marbles caused later policy uses of modelling.
How this study connects
Role on claims
Each row is a claim on a concept or method page where this paper supports, challenges, or qualifies the statement. Roles are hand-checked — not a model guess.
Reed-Frost theory, taught with a trough and colored marbles, made epidemics an academic research object without replacing fieldwork.
Evidence for the claim as stated.
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