Thus , human - mediated disturbance can either increase or decrease species diversity in a landscape , causing a corresponding change in pathogenic diversity .
Infectious diseases can be either chronic or acute , and epidemic or endemic , impacting the population in any given community to different extents .
Human - mediated disturbance can either increase or decrease species diversity in a landscape , causing a corresponding change in pathogenic diversity .
Infectious diseases can be either chronic or acute , and epidemic or endemic , impacting the population in any given community to different extents .