Hostname: page-component-76fb5796d-5g6vh Total loading time: 0 Render date: 2024-04-29T13:49:38.169Z Has data issue: false hasContentIssue false
  • English
  • Français

Factors influencing development of free-living generations of Strongyloides stercoralis

Published online by Cambridge University Press:  06 April 2009

K. Shiwaku ,
Y. Chigusa ,
T. Kadosaka  and
K. Kaneko
K. Shiwaku
Affiliation:
Department of Parasitology, Aichi Medical University, Nagakute-cho, Aichi-gun, Aichi 480-11, Japan
Y. Chigusa
Affiliation:
Department of Parasitology, Aichi Medical University, Nagakute-cho, Aichi-gun, Aichi 480-11, Japan
T. Kadosaka
Affiliation:
Department of Parasitology, Aichi Medical University, Nagakute-cho, Aichi-gun, Aichi 480-11, Japan
K. Kaneko
Affiliation:
Department of Parasitology, Aichi Medical University, Nagakute-cho, Aichi-gun, Aichi 480-11, Japan
Get access Rights & Permissions [Opens in a new window]

Summary

The effects of duration of infection and of temperature and nourishment in cultures on development of free-living generations of Strongyloides stercoralis were studied quantitatively. Rhabditiform larvae, 228–353 μm long, were collected from infected dogs with or without prednisolone treatment using the Baermann apparatus. Cultures were carried out by the filter paper test-tube method under the following conditions: incubation temperature 15–40°C and faecal dilution 1:0–1:16. Rhabditiform larvae developed predominantly to free-living females at incubation temperatures of 15–30°C and low faecal dilutions, but filariform larvae appeared mainly under extreme conditions such as high temperature. Recovery rates of filariform larvae were inversely related to those of females. It was remarkable that high temperature, but not low faecal dilution, affected development of filariform larvae. Although the appearance of free-living males was constant in various environmental conditions, the present study indicated an increase in free-living males with the duration of infection. Thus, it seems that free-living males are already fixed as male in the egg stage, and potential female rhabditiform larvae differentiate into free-living females or filariform larvae depending on environmental factors. There is no marked difference in the development of rhabditiform larvae into filariform larvae in either the immunosuppressed dog or the intact dog.

Type
Research Article
Information
Parasitology , Volume 97 , Issue 1 , August 1988 , pp. 129 - 138
Copyright
Copyright © Cambridge University Press 1988

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

Abe, Y., Tanaka, H., Nagano, K. & Izumi, M. (1966). Comparison of the development of free-living generation of Strongyloides ratti in different cultivation methods. Japanese Journal of Parasitology 15, 369–70. [In Japanese.]Google Scholar
Arizono, N. (1976 a). Studies on the free-living generations of Strongyloides planiceps Rogers, 1943. I. Effects of quantity of food and population density on the developmental types. Japanese Journal of Parasitology 25, 274–82.Google Scholar
Arizono, N. (1976 b). Studies on the free-living generations of Strongyloides planiceps Rogers, 1943. II. Effect of temperature on the developmental types. Japanese Journal of Parasitology 25, 328–35.Google Scholar
Beach, T. D. (1936). Experimental studies on human and primate species of Strongyloides. V. The free-living phase of the life cycle. American Journal of Hygiene 23, 243–77.Google Scholar
Faust, E. C. (1933). Experimental studies on human and primate species of Strongyloides. II. The development of Strongyloides in the experimental host. American Journal of Tropical Medicine 18, 114–32.Google Scholar
Galliard, H. (1967). Pathogenesis of Strongyloides. Helminthological Abstract 36, 247–60.Google Scholar
Genta, R. M., Schad, G. A. & Hellman, M. E. (1986). Strongyloides stercoralis: parasitological, immunological and pathological observations in immunosuppressed dogs. Transactions of the Royal Society of Tropical Medicine and Hygiene 80, 34–41.Google Scholar
Kreis, H. A. (1932). Studies on the genus Strongyloides (Nematodes). American Journal of Hygiene 16, 450–91.Google Scholar
Little, M. D. (1962). Experimental studies on the life cycle of Strongyloides. Journal of Parasitology 48, 41.Google Scholar
Moncol, D. J. & Triantaphyllou, A. C. (1978). Strongyloides ransomi: Factors influencing the in vitro development of the free-living generation. Journal of Parasitology 64, 220–5.CrossRefGoogle ScholarPubMed
Nishigori, M. (1928). The factors which influence the external development of Strongyloides stercoralis and on autoinfection with this parasite. Taiwan Igakkai Zasshi 227, 397–431. [In Japanese.]Google Scholar
Nwaorgu, O. C. (1983). The development of the free-living stages of Strongyloides papillosus. I. Effect of temperature on the development of the heterogonic and homogonic nematodes in faecal culture. Veterinary Parasitology 13, 213–23.CrossRefGoogle ScholarPubMed
Premvati, (1958). Studies on Strongyloides of primates. II. Factors determining the ‘direct ’and the ‘indirect ’mode of life. Canadian Journal of Zoology 36, 185–95.Google Scholar
Sandground, J. H. (1926). Biological studies on the life-cycle in the genus Strongyloides Grassi, 1879. American Journal of Hygiene 6, 337–88.Google Scholar
Schad, G. A., Hellman, M. E. & Muncey, D. W. (1984). Strongyloides stercoralis: Hyperinfection in immunosuppressed dogs. Experimental Parasitology 57, 287–96.CrossRefGoogle ScholarPubMed
Suto, C., Taguchi, I. & Kumada, N. (1986 a). Studies on the development of Strongyloides ratti. 1. New culture method and changes of developmental types after infection. Japanese Journal of Parasitology 35 (Suppl.), 113. [In Japanese.]Google Scholar
Suto, C., Taguchi, I. & Kumada, N. (1986 b). Studies on the development of Strongyloides ratti. 2. Effect of acquired immunity and immunosuppressant on the developmental types. Japanese Journal of Parasitology 35 (Suppl.), 150. [In Japanese.]Google Scholar
Tanabe, K. (1938 a). On influence of environment upon the development of Strongyloides ratti. Keio Igaku 18, 987–99. [In Japanese.]Google Scholar
Tanabe, K. (1938 b). Supplemental studies on determination of the types of the larvae in Strongyloides ratti. Keio Igaku 18, 1139–43. [In Japanese.]Google Scholar
Varju, L. (1966). Studies on Strongyloidosis. VII. The nature of changes in the developmental course of swine Strongyloides. Zeitschrift für Parasitenkunde 28, 175–92.Google ScholarPubMed