Slides in this set
Communicable diseases (infectious diseases) are
cause by microorganisms.
Microorganisms single celled organisms.
Microorganisms that cause disease are called
The most common pathogens are;
Infection and Transmission
Infection occurs when a pathogen;
Enters the host
Colonises the tissues of the host
Resists the defences of the host
Causes damage to the host tissues
Transmission when a pathogen is transferred from
one individual to another.
Transmission may occur through;
Direct contact (including sexual intercourse)
Animals (vectors)…read more
Entry and Prevention
A pathogen may gain entry to the host through;
The respiratory system (nose, mouth)
The digestive system (food and water may carry pathogens
into the stomach and intestines via the mouth)
The urino-genitary system
The body prevents the entry of pathogens with
A thick layer of skin
· Found in the respiratory and reproductive systems
Enzymes that specifically destroy pathogens…read more
Spread of Disease
Overcrowded conditions enable diseases to spread
Widespread outbreaks of disease.
Epidemics that spread internationally.
Measures to protect and prevent from disease in
Clean drinking water