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77 Cards in this Set
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Deals with the study of parasites which causes human infections and the diseases they produce |
Medical Parasitology |
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Living together of two different organisms, each of a different species |
Symbiosis |
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Typea of symbiosis |
Commensalism Mutualism Parasitism |
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Association wherein one is benefited the other is neither benefited nor harm |
Commensalism |
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Associatiin beneficial to both organism |
Mutualism |
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Association that is beneficial to one at the other's expense |
Parasitism |
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Entamoeba coli and man |
Commensalism |
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Entamoeba histolytica and man |
Parasitism |
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Weaker organism dependent on the host for survival |
Parasite |
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Worm parasites |
Helminths |
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Types of helminths |
Nematodes (round worm) Trematodes (flukes) Cestodes (tape worms) |
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Flatworms |
Trematodes and cestodes |
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Non-worm parasites |
Non-helminths |
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Example of non-helminths |
Protozoa and Arthropods |
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Unicellular organism which includes amoebas, ciliates, flagellates, &sporozoa |
Protozoa |
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Serves as a vector of other parasites whih includes mosquitoa, insects, tick, fleas, etc. |
Arthropods |
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Classification of parasites |
Habitat: -ectoparasite - endoparasite Host Requirement: -obligate - free-living/ facultative No. Of host requirement: -periodic -transitory Period: -incidental Permanent |
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Lives/ found on body surfaces like skin &hair |
Ectoparasite |
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Examples of ectoparasite |
Lice or fleas |
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Head louse |
Pediculus humanus capitis |
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Body louse |
Pediculus humanus corporis |
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Pubic louse or "crab louse" |
Pthirus pubis |
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Invasion of ectoparasites |
Infestation |
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Lives within the body of the host |
Endoparasite |
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Examples of endoparasite |
Entamoeba coli & E. histolytica- colon Wuchereria bancrofti - lower lymphtics Loaloa-subcutaneoua tissue Enterobius vermicularis- large intestine |
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Mere presence of endoparasite or invasion made by endoparasites |
Infection |
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Causes Filiariasis |
Wuchereria bancrofti Loa loa |
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Requires a host for survival |
Obligate |
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Example of obligate patasites |
All endoparasite |
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Can live independently without host, capable of free living existence |
Free- living/ facultative |
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Examples of free-living/ facultative |
Acanthamoeba spp. Naegleria fowleri Strongyloides fowleri |
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Parasite whose larval and adult stages are passed into different host 2 host requirements |
Periodic |
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Parasite whose larval stage is passed in a host while the adult is free living Only 1 host required |
Transitory |
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Example of periodic |
Schistosoma japonicum |
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Thise occuring in an unusual host |
Incidental |
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Example of incidental |
Angiostoma caninum |
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Those that lives in a host from early life to maturity |
Permanent |
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Life cycle of parasites |
Direct life cycle Indirect life cycle |
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If the cycle is completed in one host |
Direct life cycle |
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Example of direct life cycle |
Entamoeba histolytica Giardia lamblia Ascaris lumbricoides Enterobius lumbricoides |
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Type of cycle completed in more than one host |
Indirect life cycle |
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Those that lives in an organ different from the one it usually lives but within the same host |
Erratic |
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Example or Erratic |
Ascaris lumbricoides |
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Those that can set up a disease process in man |
Pathogenic |
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Not capable of causing disease |
Non- pathogenic/ commensal |
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Example of non-pathogenic |
Entamoeba coli Trichomonas tenax Chylomastix mesnili Endolimax nana |
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Non- human parasites that could also infect man |
Zoonotic |
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All zoonotic are pathogenic except for Entamoeba coli |
Note! |
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Examples of Zoonotic |
Ancylostoma caninum (dog hook worm) Toxocara cati (ascaris of cats) Angiostrongylus cantonensis(rat lung worm) Toxocara canis (ascaris of dogs) Dirofilaria immitis Ancylostoma braziliensis (cat hookworm) |
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Structures appearing like parasites |
Pseudoparasite |
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Examples of pseudoparasite |
Vegetable hair- helminth larva Pollen grains - helminth eggs |
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Parasite infecting another parasite |
Hyperparasite |
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Example of hyperparasite |
Ctenophalides canis - dog flea, parasite of dogs infected dby larval form of Dipylidium caninum |
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Intracellular/ Intraerythrocytic |
Parasite infecting the cell/ RBCs |
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Example of Intracellular |
Plasmodium falciparum- infect RBCs causes malaria Leishmania spp- infect reticuloendothelial cells |
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Organism which harbors the parasite and provides nourishment and shelter to the latter |
Host |
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Host that harbors the sexual or the adult stage of the parasite |
Definitive |
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Example of Definitive |
Toxoplasma gondii- cats Echinicoccus granulosus- dogs, foxes, wolves Plasmodiun spp - female Anopheles mosquitoes |
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Host that harbors the larval or the asexual stge of the parasite |
Intermediate |
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Example of intermediate |
Plasmodiun spp and Toxoplasma gondii- man Echinococcus granulosus- man Schistosoma spp - snails/ mollusk Taenia solium - pigs Taenia saginata - cows |
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Fasciola hepatica |
1 Lymnea philippinensis 2 Ipomea obscura |
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Echinostoma ilocanum |
1 Gyraulus convexiusculus 2 Pila luzonica |
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Diphyllobothrium latum |
1 Cyclops species 2 Fresh water fish |
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Type in which parasite can remain alive but no further development |
Capillaria philippinensis Host: fish eating birds |
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3 components of parasite's life cycle |
1 mode of transmission 2 infective stage 3 diagnostic stage |
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Manner of how the parasite is transmitted |
Mode of transmission |
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Acquired thru ingestion |
Entamoeba histolytica Giardia lamblia Paragonimus westermani |
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Skin penetration |
Ancylostoma caninum Necator americanus Schistosoma japonicum |
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Skin inoculation/ bite |
Wuchereria bancrofti Plasmodium falciparum Babesia microti |
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Sexul contact |
Trichomonas vaginalis |
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Responsible for transmission of parasites from one host to another |
Vector |
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Responsible for parasite transmission and at the same time tgat parasite undergo development in their body as well |
Biological vector/ true vector |
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Examples of biological vector |
Mosquitoes- Furare tropheres Sandfly- Leishmania spp Tse tse flies- Trypnosoma gambiense Ticks- Babesia microti |
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Assist in the transfer of parasite but is not essential in the cycle of the parasite |
Mechanical vector |
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Example of mechanical vector |
House fly mechanical vector for Entamoeba histolytica |
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Transfer stage/ transmitted from one host to another |
Infective stage |
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Stage retrieved from laboratory diagnostic procedures |
Diagnostic stage |