OCR AS Biology

Revision Notes

4.1.1 Common Pathogens & Communicable 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

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