The correlation structure of epidemic models.
For a general Markov SIS epidemic model, the fates of individuals at different times are shown to be positively correlated. When the population is subjected to two diseases, a certain condition, here called positive interference, results in positive correlations between individuals with respect to either disease, while another condition, called competition, gives negative correlation between diseases and positive correlation within each disease. The results generalize to two classes of diseas...Expand abstract
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