1a.1 How can diseases be classified?
How can diseases be classified?
Infectious diseases which are transmitted from animals to humans
Transmission is common, one estimate suggests that around
of infectious diseases are spread from animals.
Swine Flu - H1N1
A person, animal or plant that is a carrier of an infectious disease but is not affected by it.
Mosquito :arrow_right: Malaria
Badger :arrow_right: TB
Communicable/ non-communicable diseases
Infectious disease which spread easily from host to host.
Non-communicable: Diseases which are not passed from person to person; they are chronic diseases with a long duration and slow progression
Non-Communicable Disease: Degenerative Disease
of deaths worldwide are due to degenerative diseases.
Non-Communicable Disease: Lifestyle Disease
Contagious/ non-contagious diseases
Class of infectious disease that are easily spread by direct or indirect contact between people
Include bacterial and
Non-contagious: Diseases which are not easily spread
Infectious/ non-infectious diseases
Disease spread by pathogens
Non-infectious: diseases which are not spread from host to host and are caused by external factors.
Types of transmission
Skin to skin
Vertical transmission - mother to child.
Physical objects that can carry disease.
Short distance (<~1m)
Droplets from sneezing
Food - Ecoli
Water - Cholera
Exist permanently in a geographical area or population group
An outbreak of a disease that infects many people at the same time and spreads through a population in a restricted geographical location.
An epidemic that has spread worldwide affecting a large number of people.