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Article Abstract
Background: The disturbance of colonized trees and soil, such as through forestry activities, has been proposed to disperse soil- and tree-inhabiting fungal pathogens. sensu lato is one such pathogen that was detected on Vancouver Island, British Columbia, Canada, beginning in 1999 and caused human and animal illness.
Objectives: Our aim was to determine if s.l. human case incidence on Vancouver Island was correlated with the intensity of landscape-level tree harvesting occurring near human settlement areas.
Methods: We created buffers around human settlement areas with radii increments of , from 2.5 to , and summed the area of annual tree harvests occurring within each buffer zone. We then performed Spearman rank-order correlation to measure the association between case incidence and annual tree harvest intensity at each radius from 1998 through 2014.
Results: The incidence of was positively correlated with tree harvesting intensity only at distances of (, ) and (, ) from human settlement areas. As annual tree harvesting area increased between 1999 and 2003, so did annual incidence in humans, before both plateaued around 2002 and decreased after 2007.
Discussion: Our findings suggest that tree harvesting plays a role in the spread of on Vancouver Island. This may be due to tree cutting or soil disturbance facilitating the aerosolization of spores to increase infection risk. This research also illustrates the contribution that geographic information systems can make to public health research on environmental disturbance and disease outbreaks. https://doi.org/10.1289/EHP12396.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10355116 | PMC |
| http://dx.doi.org/10.1289/EHP12396 | DOI Listing |
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