Immunology

• bacterium 0.5 µm – 5 µm prokaryotic

  fungus 5 µm – 50 µm eukaryotic

  protist 1 µm – 2 mm eukaryotic

  virus 20 nm – 350 nm N/A
• pathogen: microorganism which are the causative agents of disease
• bacteria

  
  

  • chlamydia
  • gonorrhoea
  • tuberculosis
• viruses

  common cold

  • mumps
  • measles
• fungi - yeast infection (thrush)
• prions - Creutzfeldt–Jakob disease (CJD)
• protists - malaria
• parasites - toxoplasmosis