The other girls — victims of yesteryear's mass hysteria and today's mass psychogenic illness, in which the symptoms of hysteria pass from person to person, like contagion — believed the condition to be communicable and "caught" it.
Typically, there are many risk factors driving the emergence of the epidemic including population density, degree of transmission, degree of contagion, contact nature, water condition, and climate and so on [13, 14].
When smallpox broke out during the American Revolution, conditions for contagion were ideal.
Human beings often share physical conditions without any visible contagion.
Secondly, housing market conditions affect housing price contagion effects.
The difference recorded between the upright and upside down conditions indicates that the contagion effect was dependent on the integration of gravity constraints by body kinematics.
As for abiotic soil conditions [61], the spatial contagion of the belowground biotic mosaic may therefore induce strong selection pressure on plants and their associated herbivores, with the potential for multiple-species coevolutionary dynamics [4].
"The occurrence of yawn contagion was significantly higher during the yawning condition than during the control mouth movements.
This leads to an interesting open question under what theoretical conditions should one expect to see contagion over networks with fixed neighbors?
Uncertainty about the nature of the condition meant that even ordinary cautiousness about contagion could easily veer into avoidance or worse.
