Definitions:
– can be defined as the capacity to recognise the intrusion of material foreign to the body and to mobilise cells and cell products to remove that sort of foreign material with great speed and effectiveness.
– a disease-causing micro-organism.
– The place where the pathogen is usually found.
– is a disease which is always present at low levels (note this word has a different meaning in ecology).
– when the number of cases of a disease increase significantly.
– organisms which carry pathogens between other organisms.
– a disease which can be passed between hosts.