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Biology Unit 4
Revision Notes

Topic 6: Infection, Immunity and Forensics
11. Explain how bacterial and viral infectious diseases
have a sequence of symptoms that may result in
death, including the diseases caused by
Mycobacterium tuberculosis (TB) and Human
Immunodeficiency Virus (HIV).
Both viruses and bacteria may enter the bodies…

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Biology Unit 4
Revision Notes

Acquired Immunodeficiency Syndrome (AIDS) is caused by Human Immunodeficiency Virus (HIV).
HIV is very fragile and must be contained in human body fluids ­ it cannot survive in the air. The virus
can be transmitted from person to person in 3 main ways:



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