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Overview of pathogens and parasites
- 1. Christiane’s Parasite Overview
Categorised overview of Parasites
• subcellular: Viruses
• prokaryotes – unicellular: Bacteria
• eukaryotes:
1. Fungi
Unicellular: yeasts
Multicellular: molds
o Yeasts:
Candida albicans
Cryptococcus neoformans
Pneumocystis carinii
o Filamentous fungi:
Aspergillus fumigatus
Mucor
o Dimorphic fungi:
Histoplasma capsulatum
2. Protozoae – unicellular with complex life cycle
Reproduce directly in host
2.1. Plasmodium Malaria
2.2. Leishmania Leishmaniasis
2.3. Trypanosomes Sleeping sickness
2.4. Toxoplasma gondii Toxoplasmosis (birth defects)
3. Metazoae – multicellular, also with complex life cycle
No direct replication in definite host (where sexual maturity is reached)
3.1. Nematodes different worms
Giant roundworm
• Ascaris lumbricoides Ascariasis
Hookworm intestinal hook-
• Necator americanis worm infection
• Nippostrongylus brasiliensis
Filarial worm Filiariasis
• Wuchereria bancrofti Elephantiasis
• Onchocerca volvvulus River blindness
3.2. Trematodes “flukes”, flatworms
Schistosoma, mansoni, japonicum, haematobium
schistosomiasis
3.3. Cestodes tapeworms
Hymenolepis diminuta hymenolepiasis
• Direct life cycle = single host
• Indirect life cycle = multiple hosts