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INTRODUCTION TO

PARASITOLOGY

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PARASITOLOGY

Is the area of biology concerned with thephenomenon of dependence of one living organism

on another.

The study of parasites, their hosts, and therelationship between them.

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PARASITE

An organism that lives on or in its host, which isusually a larger organism, that provides physicalprotection and nourishment.

An organism that has sustained contact withanother organism to the detriment to the hostorganism.

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FIELDS /BRANCHES OF

PARASITOLOGY

Medical parasitology

Veterinary parasitology

Structural parasitology Quantitative parasitology

Parasite ecology

Conservation biology of parasiteTaxonomy and phylogenetics

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PREDATOR those that attack another living animal, not

necessarily killing them. ( attacker)

PREY

They are the victim.

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HOST

The organism from which a parasite obtains itsnutrition and/or shelter.

Intermediate host- is used normally by a parasitein the course of its life cycleand it which it may multiplyasexually and but not sexually

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Definitive host- is the host in which the sexual

reproduction of parasite takes

place.

Reservoir host- is an organism in which aparasite that is pathogenic for

some other species, lives and

multiplies usually withoutdamaging its host.

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SCAVENGERS

Devouring those dead of natural causes or taking

the leavings of the predator.

SYMBIOSIS

Living together in more or less intimateassociation or close union of two dissimilarorganisms

From the Greek symbiosis which means the stateof living together.

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DIFFERENT FORM OF SYMBIOSIS

Commensalism

- means eating at the same table

- association that is beneficial to one partner

and at least not disadvantageous to theother.

- a relation between two kinds of organisms

in which one obtains food or other benefitsfrom the other without damaging it.

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SPECIALIZED TYPE OFCOMMENSALISM

Mutualism- association is beneficial to booth.

Parasitism- symbiotic relationship in which one

organism , the host is to somedegree injured thru the activities of

the other.

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VECTORS

Hosts that transmit parasites to man.

BIOLOGIC VECTORS

those that are essential in the life cycle.

PHORETIC OR MECHNICAL VECTORS

Those that are not essential in the life cycle.

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ZOONOSIS

Disease of animals (literally)

Disease of animals that are transmissible to manCLASSIFICATION OF ZOONOSIS

Euzoonosis- Common to man and reservoir

host. Parazoonosis- man is infrequent host and

incidental

Anthropozoonosis- infection acquired by manfrom other vertebrates.

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Zooanthroponosis- human infection that maybe

acquired by other vertebrates

Obligate parasite- cannot exist without the host

Facultative parasite- can be free living or parasitic

Amphizoic- free living amoeba that may invade

and colonize the brain and othersites( Naegleria and Acanthomoeba)

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Spurious- Free living parasites or organisms that

parasitize other hosts,

- they merely passed the intestine ,

- recovered in living or dead state from

he human feces.