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77 Cards in this Set

  • Front
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Deals with the study of parasites which causes human infections and the diseases they produce

Medical Parasitology

Living together of two different organisms, each of a different species

Symbiosis

Typea of symbiosis

Commensalism


Mutualism


Parasitism

Association wherein one is benefited the other is neither benefited nor harm

Commensalism

Associatiin beneficial to both organism

Mutualism

Association that is beneficial to one at the other's expense

Parasitism

Entamoeba coli and man

Commensalism

Entamoeba histolytica and man

Parasitism

Weaker organism dependent on the host for survival

Parasite

Worm parasites

Helminths

Types of helminths

Nematodes (round worm)


Trematodes (flukes)


Cestodes (tape worms)

Flatworms

Trematodes and cestodes

Non-worm parasites

Non-helminths

Example of non-helminths

Protozoa and Arthropods

Unicellular organism which includes amoebas, ciliates, flagellates, &sporozoa

Protozoa

Serves as a vector of other parasites whih includes mosquitoa, insects, tick, fleas, etc.

Arthropods

Classification of parasites

Habitat:


-ectoparasite


- endoparasite


Host Requirement:


-obligate


- free-living/ facultative


No. Of host requirement:


-periodic


-transitory


Period:


-incidental


Permanent

Lives/ found on body surfaces like skin &hair

Ectoparasite

Examples of ectoparasite

Lice or fleas

Head louse

Pediculus humanus capitis

Body louse

Pediculus humanus corporis

Pubic louse or "crab louse"

Pthirus pubis

Invasion of ectoparasites

Infestation

Lives within the body of the host

Endoparasite

Examples of endoparasite

Entamoeba coli & E. histolytica- colon


Wuchereria bancrofti - lower lymphtics


Loaloa-subcutaneoua tissue


Enterobius vermicularis- large intestine

Mere presence of endoparasite or invasion made by endoparasites

Infection

Causes Filiariasis

Wuchereria bancrofti


Loa loa

Requires a host for survival

Obligate

Example of obligate patasites

All endoparasite

Can live independently without host, capable of free living existence

Free- living/ facultative

Examples of free-living/ facultative

Acanthamoeba spp.


Naegleria fowleri


Strongyloides fowleri

Parasite whose larval and adult stages are passed into different host


2 host requirements

Periodic

Parasite whose larval stage is passed in a host while the adult is free living


Only 1 host required

Transitory

Example of periodic

Schistosoma japonicum

Thise occuring in an unusual host

Incidental

Example of incidental

Angiostoma caninum

Those that lives in a host from early life to maturity

Permanent

Life cycle of parasites

Direct life cycle


Indirect life cycle

If the cycle is completed in one host

Direct life cycle

Example of direct life cycle

Entamoeba histolytica


Giardia lamblia


Ascaris lumbricoides


Enterobius lumbricoides

Type of cycle completed in more than one host

Indirect life cycle

Those that lives in an organ different from the one it usually lives but within the same host

Erratic

Example or Erratic

Ascaris lumbricoides

Those that can set up a disease process in man

Pathogenic

Not capable of causing disease

Non- pathogenic/ commensal

Example of non-pathogenic

Entamoeba coli


Trichomonas tenax


Chylomastix mesnili


Endolimax nana

Non- human parasites that could also infect man

Zoonotic

All zoonotic are pathogenic except for Entamoeba coli

Note!

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)

Structures appearing like parasites

Pseudoparasite

Examples of pseudoparasite

Vegetable hair- helminth larva


Pollen grains - helminth eggs

Parasite infecting another parasite

Hyperparasite

Example of hyperparasite

Ctenophalides canis - dog flea, parasite of dogs infected dby larval form of Dipylidium caninum

Intracellular/ Intraerythrocytic

Parasite infecting the cell/ RBCs

Example of Intracellular

Plasmodium falciparum- infect RBCs causes malaria


Leishmania spp- infect reticuloendothelial cells

Organism which harbors the parasite and provides nourishment and shelter to the latter

Host

Host that harbors the sexual or the adult stage of the parasite

Definitive

Example of Definitive

Toxoplasma gondii- cats


Echinicoccus granulosus- dogs, foxes, wolves


Plasmodiun spp - female Anopheles mosquitoes

Host that harbors the larval or the asexual stge of the parasite

Intermediate

Example of intermediate

Plasmodiun spp and Toxoplasma gondii- man


Echinococcus granulosus- man


Schistosoma spp - snails/ mollusk


Taenia solium - pigs


Taenia saginata - cows

Fasciola hepatica

1 Lymnea philippinensis


2 Ipomea obscura

Echinostoma ilocanum

1 Gyraulus convexiusculus


2 Pila luzonica

Diphyllobothrium latum

1 Cyclops species


2 Fresh water fish

Type in which parasite can remain alive but no further development

Capillaria philippinensis


Host: fish eating birds

3 components of parasite's life cycle

1 mode of transmission


2 infective stage


3 diagnostic stage

Manner of how the parasite is transmitted

Mode of transmission

Acquired thru ingestion

Entamoeba histolytica


Giardia lamblia


Paragonimus westermani

Skin penetration

Ancylostoma caninum


Necator americanus


Schistosoma japonicum

Skin inoculation/ bite

Wuchereria bancrofti


Plasmodium falciparum


Babesia microti

Sexul contact

Trichomonas vaginalis

Responsible for transmission of parasites from one host to another

Vector

Responsible for parasite transmission and at the same time tgat parasite undergo development in their body as well

Biological vector/ true vector

Examples of biological vector

Mosquitoes- Furare tropheres


Sandfly- Leishmania spp


Tse tse flies- Trypnosoma gambiense


Ticks- Babesia microti

Assist in the transfer of parasite but is not essential in the cycle of the parasite

Mechanical vector

Example of mechanical vector

House fly mechanical vector for Entamoeba histolytica

Transfer stage/ transmitted from one host to another

Infective stage

Stage retrieved from laboratory diagnostic procedures

Diagnostic stage