CIE A Level Biology (9700) 2019-2021

Revision Notes

10.1.1 Infectious Diseases

Infectious Diseases

  • A disease is an illness or disorder of the body or mind that leads to poor health
  • Each disease is associated with a set of signs and symptoms
  • Infectious diseases are caused by pathogens and are transmissible (can be spread between individuals within a population)

Infectious & non-infectious disease table

Infectious and non-infectious disease table, downloadable AS & A Level Biology revision notes

Common Pathogens & Their Diseases

  • A number of infectious diseases of worldwide importance are: cholera, malaria, tuberculosis (TB), HIV/AIDS, smallpox and measles
  • Worldwide the number of people infected with these diseases remains very high and these diseases pose serious public health problems now and for the foreseeable future
  • To control a disease, it is very important to know what causes it (known as the causative agent or pathogen)

Common pathogens & their diseases table

Common pathogens & their diseases table, downloadable AS & A Level Biology revision notes


Alistair graduated from Oxford University in 2014 with a degree in Biological Sciences. He has taught GCSE/IGCSE Biology, as well as Biology and Environmental Systems & Societies for the International Baccalaureate Diploma Programme. While teaching in Oxford, Alistair completed his MA Education as Head of Department for Environmental Systems and Societies.

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