communicable diseases

• Bacteria


  • Make you feel ill
  • Produce toxins that damage your cells and tissue
• Viruses


  • Not cells
  • Reproduce rapidly
• Communicable disease


  Infectious and can easily spread
• The cell damage is what makes you feel ill
• Protists


  • Eukaryotes
  • Single-celled
• Some protists


  • Parasites
  • Live on or in other organisms
  • Cause them damage
  • Often transferred by a vector
• Fungi


  • Some are single-celled, others have a body made from hyphae
  • Hyphae grow and penetrate human skin and plant surfaces, causing disease
  • Hyphae can produce spores that spread to other plants and animals
• Pathogens can be picked up by drinking or bathing in dirty water
• Pathogens can be carried in the air and can be breathed in, some are carried in droplets when you sneeze or cough
• Pathogens can be picked up by contaminated surfaces, including the skin