Atypical hyperpachymorph Trypanosoma (Nannomonas) congolense forest-type in a dog returning from Senegal.
Trypanosoma congolense forest-type was identified by PCR in France, in a dog returning from Senegal. This paper describes the morphological features of the parasite on Giemsa-stained smears. Slender forms and "latent bodies" represent 30.4% and 20.4%, respectively. Some rosettes have been observed (0.8%). The predominant form (48.4%) is stumpy, close to "montgomeryi-form", but it is unusually broad, with a width/length ratio (WLr) of 0.40-0.55, while that of "montgomeryi-forms" is close to 0.3. To the best of our knowledge, this is the first description of such a form of T. (Nannomonas). Also unusual, the shape of the cytoplasm appears to be tightened by an "S-" or "C-" shaped flagellum. We propose naming this peculiar morphotype "hyperpachymorph", and adding its description to that of T. congolense forest-type. Thus T. (Nannomonas) forms would include: sphaeromorph or "latent body-form" (globular), hyperleptomorph (rodhaini-form, very long and slender, with a free flagellum); leptomorph (simiae-form, slender, with a free flagellum); isomorph (congolense-form, short, generally without a free flagellum); pachymorph (montgomeryi-form, short and stout; 0.25 < WLr < 0.34, without a free flagellum), and hyperpachymorph ("hyper montgomeryi-form", short and very stout; 0.35 < WLr < 0.7, without a free flagellum).
Centre de Coopération Internationale en Recherche Agronomique pour le Développement (CIRAD), UMR Intertryp, 34398 Montpellier, France. marc.desquesnes@cirad.fr
M
M
Desquesnes
S
S
Ravel
J Y
JY
Deschamps
B
B
Polack
F
F
Roux
D000818:Animals; D016054:DNA, Protozoan / Q000302:isolation & purification; D004283:Dog Diseases / Q000188:drug therapy / Q000469:parasitology*; D004285:Dogs; D017809:Fatal Outcome; D005602:France; D007273:Injections, Intramuscular / Q000662:veterinary; D008297:Male; D010419:Pentamidine / Q000008:administration & dosage / Q000627:therapeutic use; D016133:Polymerase Chain Reaction / Q000662:veterinary; D012675:Senegal; D014195:Travel; D014344:Trypanocidal Agents / Q000008:administration & dosage / Q000627:therapeutic use; D014348:Trypanosoma congolense / Q000145:classification / Q000235:genetics / Q000302:isolation & purification* / Q000648:ultrastructure; D014353:Trypanosomiasis, African / Q000188:drug therapy / Q000469:parasitology / Q000662:veterinary*
D016054:DNA, Protozoan; D014344:Trypanocidal Agents; D010419:Pentamidine