This video is a brief overview of Infectious Diseases. We will take a look at what they are, some terms used to describe characteristics of infectious diseases and different types. Historically, infectious diseases were the main cause of deaths around the world. Even now, they are a significant global public health issue leading to millions of deaths each year.

This video was created by Ranil Appuhamy
Voiceover – James Clark

For more information about infectious diseases, have a look at these websites:

http://www.who.int/topics/infectious_diseases/en/
https://www.cdc.gov/diseasesconditions/
https://wwwnc.cdc.gov/eid/

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These videos are provided for educational purposes only. Users should not rely solely on the information contained within these videos and is not intended to be a substitute for advice from other relevant sources. The author/s do not warrant or represent that the information contained in the videos are accurate, current or complete and do not accept any legal liability or responsibility for any loss, damages, costs or expenses incurred by the use of, or reliance on, or interpretation of, the information contained in the videos.
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Aetiology of disease caused by external factors.
The cause of a disease is correctly described as the aetiology. Aetiology is ‘that which causes’. Factors which may be involved in disease causation are therefore termed aetiological factors. So the aetiology causes the pathophysiology which in turn generates the clinical features of the disease. Aetiological factors may arise from within the individual, or from the environment the person is exposed to. Factors arising from within are called endogenous; those from the environment are exogenous.
Any factor from the environment which contributes to disease aetiology is exogenous. These factors are also commonly referred to as environmental. This environment includes the one experienced in the uterus, before birth.

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