Parasitic Diseases

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Parasitic Diseases

• 4-H Veterinary Science
• Extension Veterinary Medicine
• Texas AgriLife Extension Service
• College of Veterinary Medicine and Biomedical
  Sciences
• Texas AM System
• http//aevm.tamu.edu

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Objectives

• Describe diseases caused by arthropods
• Describe diseases caused by nematodes
• Describe diseases caused by tapeworms
• Describe diseases caused by flukes
• Describe diseases caused by protozoa

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Overview

• Remember
• Five infectious diseases
• Bacterial
• Viral
• Fungal
• Parasitic
• Rickettsial

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• Infectious disease
• An illness due to a specific infectious agent or
  its toxic products that arises through
  transmission of that agent or its products from
  an infected person, animal or reservoir to a
  susceptible host, either directly or indirectly

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• Parasite
• An organism that grows, feeds, and is sheltered
  on or in a different organism while contributing
  nothing to the survival of its host
• Types
• Arthropods
• Worms
• Protozoa

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• Arthropods
• Affect
• Skin
• Digestive system
• Examples
• Flies
• Ticks
• Fleas
• Lice
• Mites

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• Worms
• Affect
• Skin
• Digestive system
• Circulatory system
• Types
• Nematodes
• Tapeworms
• Flukes

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• Protozoa
• Single-celled organisms
• Affects
• Digestive system
• Reproductive system
• Types
• Amoebas
• Ciliates

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• Infestation
• To inhabit or overrun in numbers or quantities
  large enough to be harmful, threatening, or
  obnoxious
• Infection
• Invasion by and multiplication of pathogenic
  microorganisms in a bodily part or tissue, which
  may produce subsequent tissue injury and progress
  to overt disease through a variety of cellular or
  toxic mechanisms

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• Parasites may be vectors
• Mechanical
• Carries the pathogen, but the pathogen is not
  altered while on the vector
• Example
• Arthropods
• Animals (wild or domestic)
• People
• Biological
• An organism that is needed for the life cycle of
  a pathogen
• Disease agent multiplies or develops within
  parasite
• Example
• Arthropods

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Skin

• Arthropods
• Ectoparasites
• External parasites
• Cause infestations
• Not worms, bacteria, viruses or fungi
• Affect health
• Tissue damage
• Blood loss
• Annoyance
• Vectors

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• Flies
• Blood-suckers
• Annoyance
• Anemia
• Disease transmission
• Anaplasmosis
• Bluetongue
• Heartworms
• Examples
• Horseflies
• Deerflies
• Stableflies
• Hornflies
• Mosquitoes
• Gnats
• Non-blood suckers
• Annoyance
• Example
• Houseflies

Housefly
Mosquito
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• Heartworms

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• Flies

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• Heelflies
• Larval stages
• Cattle grubs
• Cause
• Migratory damage
• Internal tissue
• Hide

Cattle grub
Heelfly
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Development Process of a Heelfly
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• Ticks
• Two groups
• Hard ticks
• Soft ticks
• Adults are free-living

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• Hard ticks
• Feed for several days
• Vectors
• Anaplasmosis
• Lyme disease
• Soft Ticks
• Intermittent feeders
• Spinose ticks

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