Communicable disease

• pathogens 


  easily spread. both plants and animals can be infected
• Bacteria 


  Very small cells that produce rapidly

  make you feel ill by producing toxins and damage cells and tissues
• Viruses aren’t cells

  • They are tiny 1/100 of a bacteria
  • reproduce rapidly
  • live inside cells and replicate themselves using cells machinery to produce copies the cell bursts
  • cell damage makes you feel ill
• Protists

  • single cell eukaryotes
  • parasites- live on / inside other organisms. vector eg insect carries protist
• Fungi

  • single celled
  • grow and penetrate human skin
  • spores
• How they are spread

  • water- bathing Or drink dirty water eg cholera
  • air- breathed in. airborne pathogens carried by air droplets eg flu
  • direct contact - touching m eg athletes foot