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• W2327888978 abstract "Paragonimus kellicotti is a trematode that inhabits the lung tissue of various crayfish-eating mammals in the United States. Ameel (1934, American Journal of Hygiene 19: 279-317) examined some of the factors affecting miracidial development of this parasite. Using eggs obtained from host lung tissue, Ameel found normal optimal miracidial development at 2 to 3 wk at 27 C, and factors such as desiccation and temperature reduction were found either to kill the embryo or lengthen developmental time. Under natural conditions, however, eggs are coughed up by the host, swallowed, and passed in the feces. This study was undertaken to compare developmental time of eggs from feces with that of eggs recovered from host lung tissue. Specific-pathogen-free cats supplied by the Research Animal Resource Center at the University of Wisconsin-Madison were used to provide parasite eggs for study. The cats were infected with P. kellicotti by feeding them metacercarial cysts obtained from heart tissue of naturally infected crayfish from area streams. Eggs were obtained from lung tissue at time of necropsy and from multiple fecal samples. Eggs from both sources were rinsed repeatedly on a 40-micron mesh screen to remove debris. Samples were placed on Harada-Mori and in shallow dish cultures, and incubated at 27 C and 22 C. Observations of development in the miracidia were made approximately every other day using a light microscope at 400 x magnification. Miracidial development was considered completed when the fully formed, active larval stage could be seen in at least 2 separate eggs. Analysis of data was done using the 23 factorial design of experiments method to detect significance of results and to test for any interaction between the variables in the experimental design. The results are summarized in Table I. Analysis of data demonstrates a highly significant differe ce in development time when sample source (i.e., feces vs. lung) was compared. The results also show a significant difference detected in eggs incubated at different temperatures. There was no significant difference detected in time required for development between the 2 culture media used, nor was there any evidence of 2or 3-way interactions in operation. The time for miracidial development of 2 to 3 wk at 27 C and temperature-dependent reduction in development of lung-derived eggs is in agreement with work by Ameel (1934, loc. cit.). The results indicate a significant delay of miracidial development in eggs collected from feces and lungs. The difference in time required for development can only be attributed to the passage of eggs through the host's alimentary tract. This route is the only variable, since both lungand feces-derived eggs were held under identical culture and temperature conditions during the developmental period. The factors or conditions in the intestinal tract that may be influential in causing inhibition of miracidial development await further study. The data suggest that the time for miracidial development under natural conditions should be considered to be 5 wk rather than the commonly accepted 2 to 3 wk. The nature of the life cycle of this parasite, where eggs normally pass through the digestive tract, supports this claim. The author acknowledges the aid of Dr. William C. Burns in this study." @default.
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• W2327888978 date "1986-10-01" @default.
• W2327888978 modified "2023-09-23" @default.
• W2327888978 title "Factors in Developmental Delay of Paragonimus kellicotti Miracidia" @default.
• W2327888978 doi "https://doi.org/10.2307/3281476" @default.
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• W2327888978 hasPublicationYear "1986" @default.
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