pathogens

• what is a pathogen?

  microorganism which causes disease
• what are the 4 main types of pathogens?

  1. viruses e.g HIV/Tobacco mosaic virus
  2. bacteria e.g salmonella/agrobacterium
  3. fungi e.g athletes foot/rose black spot
  4. protist e.g malaria/downy mildew
• what is the life cycle of a pathogen?


  they infect a host,reproduce themselves or replicate if a virus,spread from their host and infect other organisms
• what are communicable diseases?

  Diseases that can be transmitted from one person to another caused by a pathogen
• what is transmission?

  the spreading of a pathogenic disease e.g by touch,food,water
• types of transmission

  1. direct contact
  2. water
  3. air
  4. unhygienic food preparation
  5. vector