Chapter 17 Pt 1

Chapter 17 Pt 1 - Companion Animals Chapter 17 Parasites...

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Companion Animals Chapter 17 Parasites and Pests of Companion Animals
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Introduction In most cases, parasites obtain nutrients from and cause injury to the host: Ectoparasites are found on the external skin surface Endoparasites are inside the host Vectors are living carriers of disease Each parasite has a life cycle Eggs, larvae, nymphs, pupae, adults Hosts are the animals that harbor adult parasites
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Introduction Several phyla of companion animal parasites Arthropoda Nematoda Acanthocephela Trematoda Cestoda Protozoa Medications effective against one phylum are often not effective against other phyla
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Arthropoda Are invertebrate animals Over 1,000,000 species More than all other animals combined Classes Insecta and Arachnida Insecta Diptera (flies) Phthiraptera (lice) Siphonaptera (fleas) Hymenoptera (wasps, bees, hornets, ants)
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Arthropoda Classes Insecta and Arachnida Arachnida Acari (mites and ticks) Araneae (spiders) Scorpionida (true scorpions)
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Arthropoda - Insects Ninety’percent’of’species’in’class’Arthropoda’ Bodies’with’three’sec5ons’ Head,’thorax,’abdomen’ Diptera’ "True’flies"’ Over’120,000’species’ Life’cycle’includes’ Eggs’ Larvae’ Pupa’ Adult’fly’
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Arthropoda - Insects Diptera Flies often parasitic as larvae or as adults, not both Adults may feed on blood, sweat, other secretions Culicidae (mosquitoes )– Vectors of: Heartworm disease Viral disease Allergies Sand flies- Vectors of: Leishmaniasis- protozoa that can migrate through organs or cause severe skin lesions (found in south Texas and tropical regions)
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Chapter 17 Pt 1 - Companion Animals Chapter 17 Parasites...

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