The experiments on the infectivity to mice of the <i>Ascaris</i> eggs irradiated with Cobalt<sup>60</sup>

Original Article


Korean J Parasitol. 1970 Dec;8(3):90-95. English. Published online Mar 20, 1994. http://dx.doi.org/10.3347/kjp.1970.8.3.90
Copyright © 1970 by The Korean Society for Parasitology


The experiments on the infectivity to mice of the Ascaris eggs irradiated with Cobalt⁶⁰
Ok Ran Lee,Baek Hyun Yun and Won Young Choi
Department of Parasitology, Catholic Medical College, Seoul, Korea.



Abstract
In order to find out a valuable control measure for soil-transmitted parasties, the infectivity in mice of Ascaris eggs irradiated with Cobalt⁶⁰ were examined. The results were summarised as follows. 1) In vitro, Ascaris eggs irradiated with larger doses of Cobalt⁶⁰ developed poorly, and no difference was found between fresh eggs and those cultured for a few days. 2) Ascaris eggs irradiated with doses of 200,000 rad. developed at the rate of 90% after 4 weeks, whereas those irradiated with 1,000,000 rad. developed 28%. 3) Ascaris eggs irradiated with Cobalt⁶⁰ after 2 weeks of culture were poor in development compared with those of 4 week culture. 4) Eggs cultured for 5 weeks showed weaker infectivity in mice than those cultured for 8 weeks. 5) In the control groups, the infectivity in mice of Ascaris eggs was remained the same between 5 and 8 weeks. 6) The minimum dose of Cobalt⁶⁰ irradiation effective for preventing infectivity in mice was estimated to be 200,000 rad.

Tables


	Table 1 Development of Ascaris eggs after irradiation with Cobalt⁶⁰ (in percentage)


	Table 2 Development of Ascaris eggs after irradiation with Cobalt⁶⁰ cultured for 3 days at 29℃ before irradiation


	Table 3 The number of larvae in the lung and liver of mice infected with Ascaris eggs that were irradiated with Cobalt⁶⁰. The eggs were cultured for 2 weeks at 29℃ before irradiation


	Table 4 The number of larvae in the lung and liver of mice infected with Ascaris eggs that were irradiated with Cobalt⁶⁰. The eggs were cultured for 4 weeks at 29℃ before irradiation


	Table 5 The number of larvae in the lung and liver of mice infected with Ascaris eggs

References


1.	OSHIMA T. Standardization of techniques for infecting mice with Toxocara canis and observations on the normal migration routes of the larvae. J Parasitol 1961;47:652–656.

2.	Rim HJ. Distribution of the larvae of Toxocara canis and Ascaris lumbricoides in the tissues of mice. Korean J Parasitol 1963;1(1):37–45.

3.	Chyu I, Lee WH, Woo CK, Lee KB. [Effects Of Irradiation With Cobalt 60 To The Development Of Ascaris Eggs In Stool]. Korean J Parasitol 1970;8(1):1–4.