Warning: mkdir(): Permission denied in /home/virtual/lib/view_data.php on line 81
Warning: fopen(upload/ip_log/ip_log_2024-11.txt): failed to open stream: No such file or directory in /home/virtual/lib/view_data.php on line 83
Warning: fwrite() expects parameter 1 to be resource, boolean given in /home/virtual/lib/view_data.php on line 84 Natural infections of Asian Taenia saginata metacestodes in the livers of Korean domestic pigs
Natural infections of Asian Taenia saginata metacestodes in the livers of Korean domestic pigs
K S Eom and H J Rim**
Department of Parasitology, College of Medicine, Chungbuk National University, Cheongju 360-763, Korea.
**Department of Parasitology, College of Medicine, Korea University, Seoul 136-705, Korea.
Abstract
The Taenia species in East Asia, hitherto identified as Taenia saginata, has been recognized as differing from the classical descriptions of life cycles and was recently named Taenia saginata taiwanensis (tentatively until 1992). Major differences between T. saginata and the newly recognized Asian T. saginata are their intermediate hosts and the infected tissues. Asian T. saginata metacestodes are found in the livers of pigs rather than in the muscles of cattle. In this study, we observed the natural infection status of Asian T. saginata metacestodes in the livers of 25,358 pigs at an abattoir in Cheongju City, Korea, from 1989 to 1990. Total 256 livers (1.01%) were infected with 1-96 (mean 2.5 per capita) metacestodes. Most of the metacestodes, however, were either calcified (87.1%) or highly degenerated (12.9%). Living metacestodes were found in only 0.01% (3/25, 358) of the examined livers. And these were distributed randomly in each lobe of the livers. The liver of pigs in Korea was confirmed as an organ hosting the Asian T. saginata metacestode. But its epidemiological significance as a source of human infections should be properly evaluated because of the rarity of the living metacestodes.
Figures
Figs. 1-3 Fig. 1. Liver of a domestic pig naturally infected with many Asian Taenia saginata metacestodes on the dorsal surface.
Fig. 2. A metacestode exposed from the host tissue capsule on the cut surface of liver parenchyme.
Fig. 3. A degenerated metacestode with surrounding pus (×20).
Figs. 4-6 Fig. 4. The calcified scolex of a metacestode (×20).
Fig. 5. A living metacestode with half-evaginated scolex (×20).
Fig. 6. The scolex of a metacestode with four suckers (×50).
Tables
Table 1 Natural infection status of Asian T. saginata metacestodes in the livers of 25,358 pigs slaughtered at an abattoir in Cheongju, Korea
References
1.
Chan CH, et al. Proceedings of the First Sino-American Symposium on Biotechnology and Parasitic Disease 1987;1:65–77.
2.
Chao D, et al. Chinese J Microbiol 1979;12:108–109.
3.
Cho KM, et al. Modern Med 1967;7(4):455–461.
4.
Chung WC, et al. Proceedings of the First Sino-American Symposium on Biotechnology and Parasitic Disease; 1987. pp. 78-79.
5.
Chung WC, et al. Chinese J Parasit 1988;1(2):152–166.
6.
Cross JH, Murrell KD. The 33rd SEAMEO-TROPMED Regional Seminar on Emerging Problems in Food-Borne Parasitic Zoonoses: Impact on Agriculture and Public Health. Southeast Asian J Trop Med Public Health 1991;22(1):4–15.
7.
Fan PC, et al. Proceedings of the First Sino-American Symposium on Biotechnology and Parasitic Disease; 1987. pp. 119-125.
8.
Fan PC, et al. Chinese J Parasit 1988;1(1):56–70.
9.
Fan PC, Chung WC, Lin CY, Wu CC. Experimental infection of Thailand Taenia (Chiengmai strain) in domestic animals. Int J Parasitol 1990;20(1):121–123.
10.
Hong ST, Hong SJ, Lee SH, Kim IS, Shin JS. [A Study On The Intestinal Helminths Of The Patients In A Leprosarium In Korea]. Korean J Parasitol 1983;21(1):102–104.
11.
Kang SY, et al. Korean J Int Med 1965;8(6):341–348.
PDF Links
Full text via DOI
Download Citation 
