Why study parasitology

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• Why study parasitology?
• A. Most common way of life

2

• Why study parasitology?
• A. Most common way of life
• B. Effects on human history and life
• 1. history
• 2. health and welfare
• a. Disease
• Trypanosoma African sleeping sickness
• Plasmodium malaria
• Schistosoma human blood fluke
• Necator Ancylostoma hookworm

3

• Why study parasitology?
• A. Most common way of life
• B. Effects on human history and life
• 1. history
• 2. health and welfare
• a. Disease
• b. Malnutrition
• c. Agriculture
• d. Financial loss
• e. Overpopulation

4

• Why study parasitology?
• A. Most common way of life
• B. Effects on human history and life
• 1. history
• 2. health and welfare
• a. Disease
• b. Malnutrition
• c. Agriculture
• d. Financial loss
• e. Overpopulation
• C. Ecological and evolutionary effects

5

• II. Terminology
• A. Parasitism a symbiosis between two species
  in which the parasite
• is smaller than the host
• is physiologically dependent upon host
• has a higher reproductive rate than the host
• is potentially harmful to host

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II. Terminology A. Parasitism 1.
ectoparasite
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II. Terminology A. Parasitism 2.
endoparasite
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II. Terminology A. Parasitism 3.
parasitoid
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II. Terminology A. Parasitism 3.
parasitoid phorid fly and fire ants
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• II. Terminology
• A. Parasitism
• 4. hyperparasitism when a parasite is the
  host
• for another parasite
• mosquitos and Plasmodium
• ticks and bacteria/protozoa
• fleas and tapeworms

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II. Terminology B. Host an animal that
harbors a parasite 1. definitive host
host in which parasite reaches sexual
maturity harbors adult parasite
2. intermediate host harbors
developmental (immature) stages of
parasite
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II. Terminology B. Host 3. paratenic
host transport host parasite resides
in host, but no development occurs
4. reservoir host non-human animal that
naturally harbors a parasite that is
infective to humans 5. vector animal
(often an arthropod) that transmits a
parasite to a host is necessary for
development of parasite
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II. Terminology C. Commensalism symbiosis
in which one participant benefits,
whereas the other is neutrally affected
Entamoeba gingivalis
Demodex folliculorum
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II. Terminology D. Phoresis mechanical
transmission of a parasite parasite is
on mouthparts or body of phoretic host, but
is not physiologically dependent on host (no
development in host) E. Zoonosis
disease in humans caused by a parasite that
normally infects non-human animals F.
Epidemiology study of factors affecting
transmission and distribution of a
disease agent G. Helminth worm H.
Parasite Load number of parasites harbored by a
host