Term
| What is Trichodectes canis? |
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Definition
-Biting louse of dogs (Mallophaga)
-Head, neck, and tail regions affected
-small (1-2mm), broad, yellowish-colored louse
-Head is broader than it is long
-Antennae are 3 segmented
-Legs are stout
-Abdomen= 6 pairs of spiracles on segments 2-6 and many rows
-Hosts: Dog, wild canids
-Worldwide distribution |
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Term
| What type of lice is Trichodectes canis (biting or sucking)? |
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Definition
-Biting (large head)
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Term
| Trichodectes canis pathogenesis |
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Definition
-Can be harmful, esp in puppies/old and debilitated
-Most commonly found on the head, neck, and tail at the hair base
-Congregate around wounds (moist regions)
-Feeds on tissue debris
-Highly active
-Cause intense pruritus, scratching, biting, anxiety, and matted haircoat
-Vector of Dipylidium caninum, affected from eggs from dried host feces
-Tapeworms develop cysticercoid stage within the louse, remain quiescent until louse is ingested by the dog during grooming
-In the dog's gut, the cystercoid is liberated and develops into an adult tapeworm |
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Term
| What is the biting louse of cattle and what region is it found? |
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Definition
-Damalinia Bovis
-Found on top-line (esp withers)
-Host-specific
-1-2mm, the head is dark red and body is yellowish-white with 8 dark cross bands
-Life cycle (3-4 weeks total): egg (8 days), 3 nymph instars (18-21 days), full adults
-Large burden in winter, lethal temp ~40C, longer hair protects from grooming |
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Term
| Damalina bovis site predilection |
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Definition
-Cattle biting louse, red louse
-Most commonly found on dorsum
-infestation may extend cranially to head and caudally to tailhead |
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Term
| What is the horse biting louse and what region is it found? |
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Definition
-Damalinia equi
-Usually on back, sides of the neck, flank
-Move faster than H.asini
-Worldwide distribution
-Temperate- greatest number during winter/early spring
-Body 1-2mm long with a flat, broad, rounded head
-louse has an arc, anterior to antennae and ventral chewing mandible and thin legs
-Brown in color with yellow abdomens and contrasting dark bands |
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Term
| What species does Haematopinus asini affect? Is it a sucking/biting louse? |
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Definition
-Horse and donkey
-Worldwide distribution
-Horse sucking louse
-Affect the forelock and mane, tail base, and hairs above the hoof
-Move slowly
-Temperate- greatest number during winter/early spring
-Body 3-5mm long, grey to yellow/brown in color, narrowed head anteriorly
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Term
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Definition
-Diagnosis look for louse
-Part hair on face, neck, ears, topline, dewlap, escutcheon, tail base and tail switch
-Head, legs, feet, scrotum sheep
-Pediculosis most prevalent in winter
-Young calves may diet, pregnant cows may abort
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Term
| Treatment of Lice in cattle |
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Definition
-Treatment with synergized pyrethrins, synthetic pyrethroids, permethrin, zetacypermethrin, cyhalothrin (beef cattle only)
-Organophosphates phosmet, chlorpyrifos (cannot use on lactating dairy cattle), tetrachlorvinphos, coumaphos, diazinon (cannot use on lactating cattle)
-Macrocyclic lactones, ivermectin, eprinomectin, doramectin
-Pour on formulations effective against biting and blood-sucking lice (last 3-4 months)
-injectable formulations are most effective against bloodsucking lice
-Fix husbandry issues and clean environment
-Self-treatment devices (back rubbers, oilers, dust bags, and ear tags |
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Term
| What is the one chewing louse that affects cats? |
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Definition
-Felicola subrostratus
-may either be asymptomatic or cause severe pruritus on the back |
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Term
| What is Linognathus setosus? |
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Definition
-Sucking louse of dogs (Anoplura)
-Head and neck areas
-<2mm long when fully fed
-Long pointed head
-No eyes or ocular points
-2nd and 3rd pairs of legs are larger than 1st pair and end in stout claws
-thoracic sternal plate is absent or weakly developed
-Paratergal plates are absent from the abdomen
-Dogs and other canids
-Worldwide |
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Term
| What is Felicola subrostratus? |
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Definition
-Cat biting louse
-predilection sites include skin, face, pinnae, back
-Adults= 1-1.5mm long
-Shape of the head is very characteristic (triangular and pointed anteriorly, ventrally (median longitudinal groove that fits around individual hairs of host)
-Legs are small, slender and end in single claws
-Abdomen has 3 pairs of spiracles (smooth with few setae)
Host: cats worldwide |
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Term
| Heterodoxus spiniger affects which hosts |
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Definition
-Chewing louse of dogs
-likely evolved from Australia as a louse of marsupials then switched to dingo hosts
-found anywhere on body of the host
-seen in animals of poor health
-Cross contamination between different host species seen if animals have physical contact
-Egg--> nymph x 3---> adult |
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Term
| Haematopinus suis affects which species and what regions? |
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Definition
-Hog sucking louse
-Large (up to 6mm), common in domestic swine worldwide
-loss of maxillary palps found on other lice
-Feed on thin-skinned areas (eg. neck, jowl, flank and inner sides of legs and ears- "nests" in ears)
-Live only on swine
-Severe infestations in winter
-Vectors for swine pox, African swine fever and eperythrozoonosis |
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