Microbes and Disease
The infectious diseases are caused by pathogens.
NOT all microbes are pathogens.
But all pathogens are microbes.
A pathogen is a microbe that causes disease:
-- bacteria - bronchitous, typhoid, tuberculosis
-- viruses - warts, herpes, flu, measles, smallpox
-- fungi - athletes foot, ring worm
Once a pathogen has entered the body it has food (body) warmth and moisture. They can reproduce very quickly. Bacteria doubles every 20 mins, 1 bacteria - 20 minutes - 32,763 bacteria.
Infection - when the pathogen enters the body
Disease - when there are observable symptoms
How can we stop pathogens from entering the body?
Disinfectant - used to kill pathogens on non-living surfaces
antiseptic - used to kill pathogens on living surfaces
Bodys External Defences
Mouth - amylase in saliva breaks down pathogens - disease T.B
Nose - hairs + mucas that trap down pathogens - disease influenza
Ears - hairs + mucas/ ear wax…