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4 terms

Nematodes - Rhabditida - Rhabditoidea

Rhabditidae
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Strongyloides westeri (Threadworm)
Host: Equids
Adult: 1cm, esophagus 1/3rd body length
Eggs: thin-shelled, larvated (L1), 30-40um
LC: Direct (L3); Parasitic (homogonic) & Free-living (heterogonic);
PPP: 10-14d
SOI: Small Intestine, larvae somatic tissues; Percutaneous, per os, transmammary
Path Larvae: Erythematous RxN
CS Larvae: Urticaria
CS Adult: Diarrhea
Dx: Fecal float, foals 5mo+ age
Tx: Ivermectin
Strongyloides stercoralis (Threadworm)
Host: K9, Foxes, Feline, Zoonotic
Adult: 1cm L, esophagus 1/3rd body length
Eggs: thin-shelled, larvated (L1), 30-40um
LC: Direct (L3); Parasitic (homogonic) & Free-living (heterogonic);
PPP: 10-14d
SOI: Small Intestine, larvae in skin; Percutaneous, per os, transmammary, transplacental
Path Larvae: Erythematous RxN
CS: Young animals - diarrhea, anorexia, dullness, weight loss, urticaria
Dx: L1 & eggs w/L1 fecal float, baermann
Tx: anthelmintics
Strongyloides papillosus (Threadworm)
Host: Sheep and goats
Adult: 1cm slender, hair-like, long esophagus, cottonballs in clumps
Egg: egg with L1 30 x 40um
LC: Direct. Parasitic (homogonic) & free-living (heterogonic); arrested larvae, transmision is percutaneous, per os, prenatal or transmammary infection; L3 infective
PPP: 10-14d
SOI: adults in SI
PATH: skin penetration by larvae causes an erythematous reaction
LARVAE CS: urticaria
ADULTS CS: diarrhea
Dx: larvated eggs in fecal float or with Baermann
Strongyloides ransomi (Pig Threadworm)
Host: Swine
Adults: slender, hair-like, 1cm, long esophagus
Egg: embryonated, (oval, 30-40um)
LC:Direct. Parasitic (homogonic) & free-living (heterogonic); arrested larvae, transmision is percutaneous, per os, prenatal or transmammary infection; L3 infective
PPP: 10-14d
SOI: SI
PATH/CS: L3 skin penetration leads to erythema, large numbers in intestine cause inflammation with erosion of epithelium, neonatal pigs may die before eggs excreted with feces, infection results in strong immunity in older animals hence not clinically affected.
Dx: larvated eggs and hatched L1 in feces by Baermann technique
Tx: prevent conditions that favor development (high temp/humidity/poor hygiene), prevent accumulation of larvae, benzimidazoles and MCLs, sow 4-16 d pre-farrowing