Changes

* There are three factors which conspire with each other to produce disease.

* There are three factors which conspire with each other to produce disease.

*# The individual animal.

*# The individual animal.

*#* In particular, the animals nutritional and immune status

*#* In particular, the animal's nutritional and immune status

*#** This is modified by:

*#** This is modified by:

*#*** Recent or concurrent disease

*#*** Recent or concurrent disease

*#*** Previous exposure to the agent(s) responsible

*#*** Previous exposure to the agent(s) responsible

 

*# The disease-causing agent(s).

2. Agent(s) - a. most do not cause a uniform pattern of disease: host defences are important

*#* Most do not cause a uniform pattern of disease

b. its capacity to produce disease depends upon

*#** Host defences are important in determining the presentation of the disease.

i. the dose and /or

*#* An agent's capacity to produce disease depends upon:

ii. the virulence of the agent

*#** The dose and /or

*#** The virulence of the agent

c. several agents may be involved; usually one agent debilitates, allowing others

c. several agents may be involved; usually one agent debilitates, allowing others

to exert a greater effect within the body

to exert a greater effect within the body