Document Detail

Infective larvae of the human hookworms Necator americanus and Ancylostoma duodenale differ in their orientation behaviour when crawling on surfaces.
MedLine Citation:
PMID:  15614586     Owner:  NLM     Status:  MEDLINE    
The infective third stage larvae of hookworms infect their hosts by active skin invasion, and they find and recognize their hosts by the behavioural phases of activation, directed crawling, and penetration. Here we analyse the orientation of the infective larvae of the human hookworms Necator americanus and Ancylostoma duodenale when crawling on surfaces. Their behaviour differed from that of the larvae of the dog hookworm Ancylostoma caninum, but the two species also differed from each other. N. americanus crawled towards light, but A. duodenale did not. Both species migrated towards the warm ends of thermal gradients, and this response was more sensitive than in other skin-invading helminths (threshold 0.09 degrees C/cm). However, A. duodenale turned back and accumulated at higher temperatures than N. americanus [turn-back 45.7 (44.5-49.9) vs 41.5 (38.5-43.9) degrees C; accumulation 43.6 (41.6-46.0) vs 39.5 (37.9-43.0) degrees C]. In contrast to other skin-invading helminths, both species showed no chemo-orientation towards skin compounds when crawling on surfaces. This behaviour may reflect adaptations for reaching the skin surface from hairs or adhering material, but the differences in the orientation of the two species could not be attributed to differing transmission strategies.
Wilfried Haas; Bernhard Haberl; Syafruddin; Irfan Idris; Stephanie Kersten;
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't     Date:  2004-11-20
Journal Detail:
Title:  Parasitology research     Volume:  95     ISSN:  0932-0113     ISO Abbreviation:  Parasitol. Res.     Publication Date:  2005 Jan 
Date Detail:
Created Date:  2004-12-22     Completed Date:  2005-09-23     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8703571     Medline TA:  Parasitol Res     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  25-9     Citation Subset:  IM    
Institute for Zoology I, University Erlangen-Nuernberg, Staudtstrasse 5, 91058, Erlangen, Germany.
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MeSH Terms
Ancylostoma / isolation & purification,  physiology*
Larva / pathogenicity,  physiology
Lipid Metabolism
Necator americanus / isolation & purification,  physiology*
Skin / metabolism
Species Specificity

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