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79 Cards in this Set
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Equine ascarid, equine roundworm
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Parascaris equorum
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Prepatent is 75-80 days
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Parascaris equorum
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Largest of the equine nematodes
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Parascaris equorum
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Adults may be passed in feces and may grow to 50cm
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Parascaris equorum
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Nematodes found in the small intestine of young foals
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Parascaris equorum
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Parascaris equorum
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Parascaris equorum
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Parascaris equorum
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Parascaris equorum
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Strongylus vulgarus, S edentatus, S. equinus
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Large Strongyles
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eggs (large or small) are virtually identical, species identification is achieved by fecal culture
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Large Strongyles
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Listed as “strongyle type” in medical record when found on flotation
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Large Strongyles
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Strongyles
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Strongyles
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Strongyles
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Strongyles
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Strongyles
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Strongyles
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Intestinal threadworm of horses
Nematodes |
Strongyloides westeri
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Only the female is parasitic in the host
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Strongyloides westeri
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Prepatent period 5-7 days
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Strongyloides westeri
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Can be passed through milk to foal
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Strongyloides westeri
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Causes diarrhea in foals
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Strongyloides westeri
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Intestinal threadworm of horses
Nematodes |
Strongyloides westeri
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Only the female is parasitic in the host
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Strongyloides westeri
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Prepatent period 5-7 days
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Strongyloides westeri
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Can be passed through milk to foal
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Strongyloides westeri
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Causes diarrhea in foals
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Strongyloides westeri
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Strongyloides westeri
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Strongyloides westeri
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Strongyloides westeri
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Pinworm of horses
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Oxyuris equi
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Adults found in cecum, colon and rectum
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Oxyuris equi
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Adult females attach eggs to exterior of anus with sticky material that causes anal puritis in infected horses
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Oxyuris equi
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Adult worms often seen protruding from the anus
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Oxyuris equi
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Eggs may be larvated
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Oxyuris equi
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Prepatent 4-5 months
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Oxyuris equi
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Eggs can be recovered by using tape impressions of anus, as well as a scarping the surface of the anus
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Oxyuris equi
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Due to the intense itching, horses will rub their rumps against solid objects, causing broken hairs on the tail head
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Oxyuris equi
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Oxyuris equi
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Oxyuris equi
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Oxyuris equi
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Equine lungworm
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Dictyocaulus arnfieldi
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Found in bronchi and bronchioles of horses, mules and donkeys
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Dictyocaulus arnfieldi
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Embryonated eggs
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Dictyocaulus arnfieldi
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Eggs can be found on fresh (<24 hrs old) feces
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Dictyocaulus arnfieldi
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Larvae hatch from eggs within a few hours
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Dictyocaulus arnfieldi
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Prepatent 42-56 days
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Dictyocaulus arnfieldi
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Dictyocaulus arnfieldi
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Adult gastrointestinal nematodes
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Habronema sp
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Aberrant larvae (deposited by flies) produce cutaneous habronemiasis, aka summer sores
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Habronema sp
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Lesions vary in size and have an uneven surface that consists of a soft reddish-brown material and covers a mass of firmer granulation tissue
Seen on parts of the body that are liable to be injured: legs, withers, male genitalia, and medial canthus of the eye |
Habronema sp
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Wounds increase in size and do not respond to treatment until the following winter, when they spontaneously heal
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Habronema sp
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Diagnosis is based on biopsies and clinical signs
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Habronema sp
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Habronema sp
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Habronema sp
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Habronema sp
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Equine filarial parasite
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Onchocerca cervicalis
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Produce recurrent dermatitis
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Onchocerca cervicalis
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Periodic opthalmia
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Onchocerca cervicalis
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Adults live in the ligamentum nuchae (ligament that runs from the skull down the cervical spine)
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Onchocerca cervicalis
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Females produce microfilrariae that migrate to the dermis via connective tissues
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Onchocerca cervicalis
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Spread by biting midges
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Onchocerca cervicalis
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Cause cutaneous onchocerciasis
patchy alopecia and scaling on head, neck, shoulders and ventral midline, may be accompanied by intense puritis |
Onchocerca cervicalis
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Many horses are asymptomatic
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Onchocerca cervicalis
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Biopsy can be examined for microfilaria
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Onchocerca cervicalis
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Onchocerca cervicalis
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Lives within the conjunctival sac and on the surface of the eye
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Thelazia sp
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Remove while eye is anesthetized
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Thelazia sp
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Equine tapeworms
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Anoplocephala perfoliata and A. magna
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found in the SI, LI and cecum
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Anoplocephala perfoliata
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found in the SI and sometimes the stomach
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A. magna
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Proglottids are wider than long
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Anoplocephala perfoliata and A. magna
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has only one set of male and female reproductive organs in each proglottid
Eggs are thick walled with one or more flattened sides |
Anoplocephala perfoliata
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Grain mites are the intermediate host
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Anoplocephala perfoliata and A. magna
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Anoplocephala sp.
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Anoplocephala sp.
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Anoplocephala perfoliata
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Anoplocephala perfoliata
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