Causes of Infectious Diseases

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The HSC Biology inquiry question, How are diseases transmitted? is broken down and answered in this video. This goes through the following:

What is an infectious disease? An infectious Disease is a disease resulting in a change from normal biochemical or physiological function – this can be spread from one individual to another. What are the causative agents of an infectious disease: Virus, bacteria, protists, fungi and prion. Plants and animals can both be effected by an infectious disease. They are transmitted via direct contact, indirect contact or vector transmission. Infectious diseases have had a enormous cost for organisms – causing death, economic burdens and socio-political challenges. Different organisms have different virulence factors which aid entry into host, for example; HPV – non enveloped virus surviving outside for longer and Clostridium botulinum – is spore forming.

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