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VMS2003 Pathology of the Integument and Alimentary Systems > STEEPLECHASE - Parasites > Flashcards

STEEPLECHASE - Parasites Flashcards

1
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Nymph

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2
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Sarcoptes - burrowing mite

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3
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Psoroptes - non-burrowing mite (e.g. Psoroptes ovis)

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4
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Sarcoptes scabiei - burrowing mite

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5
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Sarcoptic mange - burrowing mite

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6
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Demodex - burrowing mite

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7
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Demodecosis/demodectic mange

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8
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Psoroptes spp. (e.g. ovis)/sheep scab - non-burrowing mite

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9
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Chorioptes spp. (e.g. bovis) - non-burrowing mite

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10
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Otodectes cynotis - non-burrowing mite

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11
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Cheyletiella spp. - non-burrowing mite

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12
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Dermanyssus spp. - non-burrowing mite

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13
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Soft tick e.g. Argas spp. of birds

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14
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Hard tick e.g. Ixodes ricinus (castor bean tick in sheep) or Ioxdes hexagonous (hedgehogs)

Transmit babesiosis, Borrelia (Lyme disease), tick pyaemia, ehrlichiosis

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15
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Questioning hard tick (Ixodidae), waiting for host e.g. Ixodes ricinus (castor bean tick in sheep) or Ioxdes hexagonous (hedgehogs)

Transmit babesiosis, Borrelia (Lyme disease), tick pyaemia, ehrlichiosis

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16
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Engorged tick

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17
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Larva tick

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18
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Nymph tick

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19
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Haemonchus contortus (nematode), female “barber’s pole” appearance

Sheep - haemonchosis, absomasum, obtain blood from mucosal vessels before final moult

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20
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Strongyle egg, 80 micrometres (Nematodirus battus egg ~ 160 micrometres long)

E.g. Trichostrongylus axei (Sheep abomasum), Trichostrongylus spp. (Sheep small intestine), egg and L3 survive in environment under adverse conditions

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21
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Rumen fluke (trematode) eggs e.g. Calicophoron daubneyi

Immature in duodenum, adults in forestomachs

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22
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Adult rumen fluke e.g. Calicophoron daubneyi

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23
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Galba truncatula - intermediate host of rumen fluke e.g. Calicophoron daubneyi, and liver fluke e.g. Fasciola hepatica

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24
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Moniezia benedeni/Moniezia expansa egg

Cestode parasite, adults in SI, calves & lambs, intermediate host = oribatid mite, solid mass of tapeworm could occlude intestinal lumen

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25
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Oribatid mite - intermediate host of cestode Moniezia benedeni/Moniezia expansa

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26
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Toxocara canis adult worms (nematode)

Dogs

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27
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Toxocara canis roundworm

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28
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Anterior end of toxocara canis

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29
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Anterior end of Toxocara cati

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30
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Unembryonated Toxocara canis egg ~80-85 by 75 micrometres

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31
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Unembryonated Toxocara cati egg 65-75 micrometres

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32
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Embryonated Toxocara canis egg

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33
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Ancylostoma caninum (hookworm)

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34
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Ancylostoma caninum (hookworm) egg

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35
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Female hookworm in humans e.g. Necator americanus/Ancylostoma duodanale

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36
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Male hookworm in humans e.g. Necator americanus/Ancyclostoma duodanale

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37
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Cutaneous larval migrans - caused by zoonotic hookworm, Ancyclostoma braziliense

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38
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Dipylidium caninum (tapeworm)

Adults = non-pathogenic, SI of dogs and cats

Intermediate hosts = fleas/lice

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39
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Dipylidium caninum tapeworm in dogs and cats

Shed segments + may cause anal discomfort and itching, proglottids become more mature as go down worm, fleas/lice required for transmission

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40
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Dipylidium caninum proglottid, 12mm long

Dogs and cats

41
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Dipylidium caninum (cestode) egg packet (120 micrometres long)

42
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Taenia tapeworm

43
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Proglottid of Taenia pisiformis (cats and dogs)

SI, infections generally asymptomatic, heavy infections = gut problems

44
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Taenia egg (can’t distinguish between species)

45
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Echinoccocus cestode

E.g. Echinoccocus granulosus, Echinococcus multilocularis

Adult worm: <1 mm scolex, neck + 3-5 proglottides, SI of dog/cat

46
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Echinococcus tapeworm eggs e.g. Echinococcus granulosas, Echinococcus mutliocularis

47
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Heavy infection of Echinococcus tapeworm e.g. Echinococcus granulosas, Echinococcus multilocularis

48
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Acaris suum - porcine giant roundworm, has 3 lips

49
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Acaris suum, porcine giant roundworm 25-40 cm long

Migratory stage of L3 to intestine, eggs resistant to low temps, disiccation and strong chemicals

50
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Female Trichuris suis - porcine whipworm (nematode)

L1 hatch out into SI and migrate to colon/caecum + moult once before penetrating mucosal lining

51
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Male Trichuris suis - porcine whipworm (nematode)

Undergo four moults

52
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Trichuris suis - porcine whipworm (nematode) in the epithelium of LI

Anterior part of parasite forms tunnel in epithelium, mouth and posterior part are unattached

53
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“Milk spot” lesions in liver caused by migrating larvae in Ascaris suum (porcine nematode)

54
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Ascaris egg (fertile), porcine nematode = Ascaris suum

55
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Ascaris egg (infertile), porcine nematode = Ascaris suum

56
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Tirchuris egg - bipolar plugs with thick outer shell, porcine nematode e.g. Trichuris suis

57
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Strongyle egg e.g. porcine nematode = Hyostrongylus rubidus (associated with ‘thin sow’ syndrome)

58
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A

Ascaridia galli - poultry roundworm

Faecal-oral transmission, eggs hatch in proventriculus, larvae in duodenal lumen and then penetrate the mucosa, causing haemorrhages then return to lumen

59
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A

Ascaridia galli (poultry nematode), in intestines

60
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Gastropod mollusc - intermediate host of Davainea proglottina (poulty cestode)

61
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Raillietina echinobothrida - poultry cestode

Intermediate host = ants, SI

62
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Ascaridia galli egg (poultry nematode)

63
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Eimeria spp. (poultry/lambs/calves, Coccidia apicomplexan protozoa)

Eimeria acervulina = upper intestine

Eimeria maxima = middle intestine

Eimeria tenella = caeca

Eimeria necatrix = middle intestine, caeca (sexual)

Eimeria brunetti = rectum

64
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(Coccidia apicompexan protozoa spp eggs, chicken)

Eimeria acervulina = upper intestine

Eimeria maxima = middle intestine

Eimeria tenella = caeca

Eimeria necatrix = middle intestine, caeca (sexual)

Eimeria brunetti = rectum

65
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Coccidiosis microscopy - poultry apicomplexan protozoa

66
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Coccidiosis microscopy - poultry apicomplexan protozoa, arrow = oocyst

67
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Ovine coccidiosis (eimeria apicomplexan protozoa) co-infection with Nematodirus nematode (eggs)

68
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Type I meront - host epithelial cell with cryptosporidium apicomplexan protozoa, bovine

69
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Cryptosporidium apicomplexan protozoa oocysts (bovine) - small and resilient, not removed by conventional water treatment, unaffected by chlorine

70
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Giardia (protozoa) trophozoite (active swimming stage, pair of small adhesive suckers)

E.g. Giardia duodenalis (other names = G. intestinalis, G. lamblia)

71
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Giardia (protozoa) cyst - Giardia duodenalis

72
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Giardiasis - parasite attaches to cells of SI, non-invasive, dense layer of parasites interferes with absorption + damages epithelial cells, causes inflammation, absorb bile salts for less digestion

73
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Giardiasis

74
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Feline tritrichomonas foetus protozoa

Causes abortion and infertility in cattle, diarrhoea in cats, only trophozoite stage, reproduce sexually

75
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Cyathostomin (strongylus spp. nematode), equine, on mucosal surface of colon

76
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Cyathostomin (equine strongylus spp, nematode), within the mucosa of colon/caecum

77
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Encysted cyathostomin larvae in muscosa (equine strongylus spp. nematode)

78
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Strongyle egg

79
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Strongylus vulgaris mouthpart, equine

80
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Strongylus edentatus mouthparts, equine

81
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A

Strongylus equinus mouthparts, equine

82
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A

Strongylus vulgaris larvae - thrombus formed in aorta of horse with mesenteric arteritis

83
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A

Anoplocephala perfoliata equine tapeworm

Segmented, lives in caecum at ileo-caecal junction, oribatid mite = intermediate host

84
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A

Oribatid mite - intermediate host of cestodes e.g. Moniezia spp. Moniezia benedeni/Moniezia expansa - calves/lambs

85
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A

Tapeworm associated disease in horses (colic) - at the ileocaecal junction

86
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A

Anoplocephala perfoliata egg (equine tapeworm)

87
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A

Parascaris equorum egg (equine ascarid spp. - nematode)

Young horses, prolific egg production, hard eggs, survive in environment, resistant to ivermectin

88
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A

Parascaris equorum (Ascarid spp., equine nematode)

89
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A

Ascarid colic - ascaris equorum (equine nematode)

Spaghetti-like

90
Q
A

Gasterophilus intestinalis larvae - equine bot (fly)

91
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A

Gasterophilus intestinalis larvae - equine bot (fly)

In the stomach, attached to the gastric mucosa + can cause ulcerative lesions

92
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A

Gasterophilus intestinalis eggs (equine bot)

93
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A

Oxyuris equi (pinworm)

Caudal intestinal tract in rectum - minor cause of perineal irritation

94
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A

Oxyuris equi (pinworm)

95
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A

Taenia/Echinococcus tapeworm eggs

96
Q
A

Strongyle egg

97
Q
A

Dicrocelium dendriticum egg (liver fluke, cattle), intermediate host = snail (Galba truncatula) and then 2^y intermediate host = snail

98
Q
A

Fasciola hepatica egg

VMS2003 Pathology of the Integument and Alimentary Systems (16 decks)

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