communicable diseases

• pathogen?

  microorganism that causes disease
• what are the 4 pathogens?

  1. virus
  2. bacteria
  3. fungi
  4. protists
• how is disease spread?

  1. vectors (organisms spreading it)
  2. air germs
  3. direct contact with mouth
  4. sharing a cup
• how can we stop disease spreading?

  1. vaccinations
  2. maintain hygiene standards (washing hands)
  3. insecticide (kills vectors)
  4. isolation
• what shape and size is a bacteria cell?

  • various shapes and sizes
  • largest is 10 micro meters long
• what shape/size is a virus cell?

  • much smaller than bacteria
  • 20-200 micro meters in diameter
• what does a bacteria cell do in the body?

  multiply rapidly once inside body and releases toxins that make us feel ill
• what does a virus cell do in the body?

  only reproduce inside a cell and copies itself. Eventually virus fills the whole host cells and bursts it open