4.1:COMMUNICABLE DISEASES, DISEASE PREVENTION IMMUNE SYSTEM

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Cards (70)

  • diseases are caused by pathogens
  • types of pathogens
    bacteria
    virus
    Protoctist
    fungus
  • viruses are non living and acellular and they are smaller than bacteria
  • viruses consists of only genetic material and can only replicate when inside the host cells
  • viruses involve injecting their nucleic acid into the host cells
  • protoctist are eukaryotes that exist as single celled organisms
  • very few protoctist are pathogens but the ones that are pathogens are extremely dangerous
  • pathogenic protoctist are parasites usually transmitted through a vector eg malaria
  • fungi are eukaryotes
  • fungi mostly affects plants
  • fungi can be single or multi cellular
  • pathogenic fungi are parasitic that are able to release enzymes that digest host tissues and feed off them