Amplified transmission in host communities following disease-induced declines

Pathogen transmission is a fundamental component of infectious disease systems, governing the speed and extent of pathogen outbreaks. Predicting transmission within and among species is therefore critical for outbreak preparedness and the effective implementation of control strategies. Epidemics themselves can alter host populations in ways that fundamentally reshape transmission, but the long-term consequences remain poorly understood. Here, we quantify changes in transmission using a surrogate pathogen in bat communities before and after the emergence of white-nose syndrome, a fungal disease that has caused widespread population declines across North America. We find that transmission increased following disease-induced declines across all species in the community. We also observed an increase in environmental contacts and expanded habitat use by individuals, suggesting that surviving bats, on average, increased their activity and opportunities for interaction despite the substantial reductions in density and costs of infection. Together, these findings demonstrate that pathogen emergence can fundamentally alter host contact patterns and transmission dynamics, emphasizing the importance of considering behavioral and ecological changes imposed by epidemics when predicting pathogen spread in naive host populations.