Nematodes 2. BVM&S Parasitology T.W.Jones
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1 Nematodes 2 BVM&S Parasitology T.W.Jones
2 Lecture topics The Ascarids Migratory & non-migratory species Hypobiosis Paratenic hosts The Strongyles Tissue feeders Migratory & non-migratory species The Hookworms Blood feeders Skin penetration Nematodes #2 2
3 Main features of the Ascarids Nematodes with a simple mouth enclosed by three lips. Males lack a bursa The infective stage is the L 2 larva enclosed in the thick-shelled egg. Often have paratenic hosts. Important parasites of Pigs, horses, poultry, cats, dogs and humans. Nematodes #2 3
4 Ascarid life cycle Gut lumen Adults Gut lumen Gut, liver or lung L 5 Egg On ground L 4 L 1 L 3 L 2 In egg Gut, liver or lung In egg Nematodes #2 4
5 Groups that you need to know about The Ascarids Migratory Non-migratory Ascaris Toxascaris Parascaris Heterakis Toxocara Ascaridia Nematodes #2 5
6 Important examples of nonmigratory ascarids Dogs & cats Toxascaris Poultry Ascaridia Heterakis Nematodes #2 6
7 L2 hatches from egg Gut L3>L4>L5>Adult Eggs L2 migrates to liver Ascaris suum L3 coughed up and swallowed L2>L3 moult in liver L3 migrates to lungs L3 enters trachea Nematodes #2 7
8 Toxocara sp Large white worm (~10cm) found in the small intestine of dogs and cats. T.canis - dogs. T.cati (T.mystax)- cats. Hepato-tracheal and somatic migration Hypobiotic larvae Endogenous transplacental infection Nematodes #2 8
9 L2 hatches in gut Toxocara canis Gut L3>L4>L5>Adults Eggs L2 inhibited in somatic tissues After 3 months of age Liver L2>L3 moults in lungs Up to 3 months of age Trachea Nematodes #2 9
10 Nematodes #2 10
11 T.canis an important zoonosis Causes visceral larva migrans. Effects usually limited to the liver but can affect other organs such as the eye. Infection by ingestion of infective eggs from dog faeces leading to larval migration. Children at particular risk from close contact with dogs or areas that are contaminated with dog faeces. Nematodes #2 11
12 Toxocara cati (mystax) Life cycle similar T.canis Transmission principally transmammary Ingestion of a paratenic host containing L 2 Prenatal infection does not take place - compare with T.canis Nematodes #2 12
13 The Strongyles Tissue feeders with large buccal capsule Bursate Infective form = ensheathed L 3 on pasture Migratory and non-migratory species Important parasites of Ruminants Equines Nematodes #2 13
14 Adaptations for tissue feeding Large buccal capsule Cutting plates Teeth Sometimes called plugfeeders Nematodes #2 14
15 Important examples of strongyles of ruminants Chabertia - Intestinal worm of sheep & cattle Oesophagostomum - Intestinal worm of sheep & goats Nematodes #2 15
16 Strongyles of equines Adults Small strongyles aka cyathostomes Large intestine Large strongyles Large intestine Infective form Ensheathed L 3 Ensheathed L 3 Larval behaviour Number of species Develop in nodules in the intestinal wall 15 Somatic migration 3 - Strongylus Nematodes #2 16
17 Gut surface - plug feeders Equine cyathostomes Adults Gut lumen Gut surface - feeds on blood L 5 Egg On pasture L 4 L 1 Fibrous nodules in gut wall L 3 L 3 L 2 Free-living Free-living Nematodes #2 17
18 L3 on pasture Gut L5>Adults Eggs L3 enters mucosa Somatic migration Strongylus Sp. Extra-intestinal stages L3>L4 moult L4>L5 moult L5 return to gut wall Nematodes #2 18
19 Strongylus sp - migratory patterns Species Strongylus vulgaris Strongylus edentatus Strongylus equinus Location of first moult Submucosa Liver Gut musculature Location of second moult Cranial mesenteric artery Flanks & hepatic ligaments Gut parenchyma Nematodes #2 19
20 Controlling equine strongyles Anthelmintics Timing Active ingredient Adults Larvae especially migratory species Rotate active ingredients to combat drug resistance Pasture management Removal of faeces Harrowing of paddocks Rotational grazing Pasture resting for 6 months Alternative species grazing e.g. sheep Nematodes #2 20
21 Main features of the the hookworms Parasites of the intestine of most higher mammals other than horses. Prominent dorsal bending of the head - hook. Buccal capsule armed with broad cutting plates or teeth. Blood feeders. The L 3 enters either orally or in some cases percutaneously. Nematodes #2 21
22 Important examples of hookworms in UK Bunostomum - found in the small intestine of ruminants. Uncinaria northern hookworm of dog, cat & fox. Ancylostoma tropical canine hookworm coming soon to a practice near you? Nematodes #2 22
23 Nematodes #2 23
24 Ascarids Mouth surrounded by three lips Thick walled egg Nematodes #2 24
25 Ascaris infection from pig Nematodes #2 25
26 White spot liver Nematodes #2 26
27 Toxascaris Nematodes #2 27
28 Ascaridia Nematodes #2 28
29 Toxocara Nematodes #2 29
30 Strongylus Damage to arterial wall by S.vulgaris larvae Damage to intestinal wall by S.equinus larvae Nematodes #2 30
31 Hookworms Nematodes #2 31
32 Bunostomum Nematodes #2 32
33 Male of Chabertia Buccal capsule Bursa with spicules Nematodes #2 33
34 Treatment regimes for equine nematodes Nematodes #2 34
35 Pasture cleaning the easy way Each horse can produce up to nine tons of waste per year! Claimed to be able suck nematode larvae from the pasture! Nematodes #2 35
Nematodes 2. Lecture topics. Ascarid life cycle. Main features of the Ascarids. Adults L 5 L 1 L 4 L 2 L 3. Groups that you need to know about
Lecture topics Nematodes 2 BVM&S Parasitology T.W.Jones The Ascarids Migratory & non-migratory species Hypobiosis Paratenic hosts The Strongyles Tissue feeders Migratory & non-migratory species The Hookworms
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