parasitic nematode infective larva (l3) identification … poster.pdf · cooperia spp. (e.g. c....
TRANSCRIPT
Head
With sheath Without sheath
Uneven tipSquared
Chabertia ovina
Oesophagostomum radiatum
Bullet-shaped
Haemonchus placei
Rounded
Bunostomum phlebotomum
Nematodirus helvetianus
X: ± 3.4
F: ± 20%
F: 40 - 45%±
X: 5.4±
X: 2.4±
F: 50%±
Tail smooth
F: 25%±
X: 5.1±
16 Intestinal cells
Nematodirus battus
X: 1.0 - 1.2±
F: 0%
Trichostrongylus axei
X: 2.2±
F: 10%±
Blunter tip
Ostertagia ostertagi
X: 2.0±
F: 20%±
Cooperia spp. (e.g. C. pectinata)
Finer tip
X: 3.1±
F: 20%±
Blunter tip
Cooperia oncophora
X: 8.3±
F: 50%±
X: 5.2±
F: 50%±
Tail notched/digitate8 Intestinal cells
Very long larvaFiner tip
Oesophagus rhabditiform
Free-living nematode(see Fig.13)
Oesophagus 40% of lengthThin larva
Strongyloides spp.
±
18 - 22 Intestinal cells
28 - 32 Intestinal cells
U N I V E R S I T Y O F P R E T O R I AU N I V E R S I T E I T V A N P R E T O R I A
Y U N I B E S I T H I Y A P R E T O R I A
Faculty of Veterinary Science
Acknowledgments: The authors are grateful for the following financial support:
(i) RED MEAT RESEARCH & DEVELOPMENT SA; (ii) Cape Wools SA; (iii) THRIP (National Research Foundation, South Africa), (iv) BBSRC/DFID/Scottish Government [grant number BBH00940/1]
Reference: Van Wyk, J.A., Mayhew, E., 2013. Onderstepoort J. Vet. Res., 80(1), Art. #539, 14 pages http:// dx.doi.org/10.4102/ojvr. v80i1.539; Van Wyk et al., 2004. Vet. Parasitol., 119, 277-306
Parasitic Nematode Infective Larva (L3) Identification Organograms – Small Ruminants + Cattle1 2J.A. van Wyk and E. Mayhew
1Department of Veterinary Tropical Diseases, Faculty of Veterinary Science, University of Pretoria, Private Bag X04, 0110 Onderstepoort, South Africa. <[email protected]>2 Department for Education Innovation, University of Pretoria
Head
With sheath Without sheath
Uneven tipSquared
Chabertia ovina
28-32 Intestinal cells
Oesophagostomum spp.
Bullet-shaped
Haemonchus contortus
Rounded
Bunostomum/Gaigeria sp.
Trichostrongylus Teladorsagia spp.
axei
Intestinal Trichostrongylus spp.
Trichostrongylus spp.(e.g. T.rugatus,T. falculatus)
Trichostrongylus spp. (e.g. T. colubriformis) Cooperia spp. e.g. C.curticei
Finer tip
Cooperia oncophora
Blunter tip
16 Intestinal cells
Tail smooth
Tail notched/digitate8 Intestinal cells
Nematodirus spp.(see Fig. 7)
X: 2.5±
F: 10%± F: 0% F ³ 20%
F: 50%±
X: 5.0 - 5.5±
X: 3.4 - 4.4±
F: 50%±
Oesophagus+ bulb
Tail smooth
Tail digitate
X: 1.0±
F: 0%±
X: 1.7±
F: 0%
F: 20 - 25%±
X: 1.5±
F: 20 - 25%±
X: 2.4±
F: 20%±
F: 25%±
X: 4.1±
X: 1.0 - 1.2±
F: 0%
X: 5.7 - 9.0±
F: 50%±
Oesophagus rhabditiform
Free-living nematode(see Fig. 13)
Oesophagus 40% of lengthThin larva
Strongyloides spp.
±
18-22 Intestinal cells
Organogram for identifying L3 of small ruminants to genus level (species names are listed, but L3 can seldom be identified to that level)
Organogram for identifying L3 of cattle to genus level (species names are listed, but L3 can seldom be identified to that level)