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

STEEPLECHASE - Parasites Flashcards

(98 cards)

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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
Oribatid mite - intermediate host of cestode Moniezia benedeni/Moniezia expansa
26
Toxocara canis adult worms (nematode) Dogs
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Toxocara canis roundworm
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Anterior end of toxocara canis
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Anterior end of Toxocara cati
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Unembryonated Toxocara canis egg ~80-85 by 75 micrometres
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Unembryonated Toxocara cati egg 65-75 micrometres
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Embryonated Toxocara canis egg
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Ancylostoma caninum (hookworm)
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Ancylostoma caninum (hookworm) egg
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Female hookworm in humans e.g. Necator americanus/Ancylostoma duodanale
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Male hookworm in humans e.g. Necator americanus/Ancyclostoma duodanale
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Cutaneous larval migrans - caused by zoonotic hookworm, Ancyclostoma braziliense
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Dipylidium caninum (tapeworm) Adults = non-pathogenic, SI of dogs and cats Intermediate hosts = fleas/lice
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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
40
Dipylidium caninum proglottid, 12mm long Dogs and cats
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Dipylidium caninum (cestode) egg packet (120 micrometres long)
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Taenia tapeworm
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Proglottid of Taenia pisiformis (cats and dogs) SI, infections generally asymptomatic, heavy infections = gut problems
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Taenia egg (can't distinguish between species)
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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
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Echinococcus tapeworm eggs e.g. Echinococcus granulosas, Echinococcus mutliocularis
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Heavy infection of Echinococcus tapeworm e.g. Echinococcus granulosas, Echinococcus multilocularis
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Acaris suum - porcine giant roundworm, has 3 lips
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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
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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
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Male Trichuris suis - porcine whipworm (nematode) Undergo four moults
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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
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"Milk spot" lesions in liver caused by migrating larvae in Ascaris suum (porcine nematode)
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Ascaris egg (fertile), porcine nematode = Ascaris suum
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Ascaris egg (infertile), porcine nematode = Ascaris suum
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Tirchuris egg - bipolar plugs with thick outer shell, porcine nematode e.g. Trichuris suis
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Strongyle egg e.g. porcine nematode = Hyostrongylus rubidus (associated with 'thin sow' syndrome)
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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
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Ascaridia galli (poultry nematode), in intestines
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Gastropod mollusc - intermediate host of Davainea proglottina (poulty cestode)
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Raillietina echinobothrida - poultry cestode Intermediate host = ants, SI
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Ascaridia galli egg (poultry nematode)
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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
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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
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Coccidiosis microscopy - poultry apicomplexan protozoa
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Coccidiosis microscopy - poultry apicomplexan protozoa, arrow = oocyst
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Ovine coccidiosis (eimeria apicomplexan protozoa) co-infection with Nematodirus nematode (eggs)
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Type I meront - host epithelial cell with cryptosporidium apicomplexan protozoa, bovine
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Cryptosporidium apicomplexan protozoa oocysts (bovine) - small and resilient, not removed by conventional water treatment, unaffected by chlorine
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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)
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Giardia (protozoa) cyst - Giardia duodenalis
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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
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Giardiasis
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Feline tritrichomonas foetus protozoa Causes abortion and infertility in cattle, diarrhoea in cats, only trophozoite stage, reproduce sexually
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Cyathostomin (strongylus spp. nematode), equine, on mucosal surface of colon
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Cyathostomin (equine strongylus spp, nematode), within the mucosa of colon/caecum
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Encysted cyathostomin larvae in muscosa (equine strongylus spp. nematode)
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Strongyle egg
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Strongylus vulgaris mouthpart, equine
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Strongylus edentatus mouthparts, equine
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Strongylus equinus mouthparts, equine
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Strongylus vulgaris larvae - thrombus formed in aorta of horse with mesenteric arteritis
83
Anoplocephala perfoliata equine tapeworm Segmented, lives in caecum at ileo-caecal junction, oribatid mite = intermediate host
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Oribatid mite - intermediate host of cestodes e.g. Moniezia spp. Moniezia benedeni/Moniezia expansa - calves/lambs
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Tapeworm associated disease in horses (colic) - at the ileocaecal junction
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Anoplocephala perfoliata egg (equine tapeworm)
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Parascaris equorum egg (equine ascarid spp. - nematode) Young horses, prolific egg production, hard eggs, survive in environment, resistant to ivermectin
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Parascaris equorum (Ascarid spp., equine nematode)
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Ascarid colic - ascaris equorum (equine nematode) Spaghetti-like
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Gasterophilus intestinalis larvae - equine bot (fly)
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Gasterophilus intestinalis larvae - equine bot (fly) In the stomach, attached to the gastric mucosa + can cause ulcerative lesions
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Gasterophilus intestinalis eggs (equine bot)
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Oxyuris equi (pinworm) Caudal intestinal tract in rectum - minor cause of perineal irritation
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Oxyuris equi (pinworm)
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Taenia/Echinococcus tapeworm eggs
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Strongyle egg
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Dicrocelium dendriticum egg (liver fluke, cattle), intermediate host = snail (Galba truncatula) and then 2^y intermediate host = snail
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Fasciola hepatica egg

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

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