INTRODUCTION
Over the past decades, archaeoparasitology has successfully reconstructed historical Korean parasite-infection prevalence. Especially, through research on parasite eggs found in Joseon-period mummies, parasitologists have revealed infection patterns and their changes over time. In our previous studies, more than 10 species of helminth eggs and larvae, i.e., Ascaris lumbricoides, Trichuris trichiura, Enterobius vermicularis, Strongyloides sp., Trichostrongylus orientalis, Clonorchis, sinensis, Paragonimus westermani, Metagonimus spp., Gymnophalloides seoi and Taenia spp., were detected from the grave samples of Joseon-period mummies. These contents are summarized in 2 review papers in detail [1,2].
Notwithstanding this wealth of scientific data, drawing definitive conclusions on the parasite infection status of our Joseon-period ancestors requires additional archaeoparasitological reports representative of much wider temporal and geographical strata [2]. Many archaeological excavations are carried out for Joseon period graves throughout the country; and during the investigations, well-preserved mummies have been discovered every year and parasitic examinations have been commissioned. Continuous parasitological research on Korean mummy specimens is thus essential to reveal parasite infection in history pattern more accurately and precisely. Herein then, we report novel parasitological data derived from recently investigated Joseon-period mummies. Consideration of these cases in conjunction with previous reports enabled us to more clearly understand the pattern of parasitism prevailing among Koreans of Joseon Dynasty period.
CASE DESCRIPTION
Archaeologists discovered the graves at Goryeong-gun (gun= County), Gyeongsangbuk-do (do=Province) (35°44′38.9″N, 128° 16′08.4″E), and Gwangmyeong-si (si=City), Gyeonggi-do (37° 26′52.0″N, 126°51′07.0″E), respectively. Judging from the clothing and grave type, archaeologists confirmed that these graves were constructed during Joseon period [3–5]. As for the Goryeong case, the Joseon grave was investigated by the Gaon Research Institute of Cultural Properties (Goryeong-gun, Korea). The grave of the Gwangmyeong case was examined by the Hangang Institute of Cultural Heritage (Seoul, Korea). The half-mummified remain was moved to a lab at the Department of Mortuary Science, College of Bio-convergence, Eulji University (Seongnam-si, Korea).
The parasitological specimens in these cases were obtained from the hip bones (Fig. 1). The organic materials precipitated on the hip bone were treated for parasitological examination. Specimens ranging in weight from 1 to 4 g were re-hydrated in trisodium phosphate buffered (0.5%) solution [6–8], filtered through gauze, and precipitated for a day. Then, the precipitates were re-dissolved in the same buffered solution (20 ml). The solution was dropped onto slides; and then prepared slides (20 μl for each; total 200 μl) were examined by a light-microscope (BH-2; Olympus, Tokyo, Japan). The parasite eggs’ size was measured, and the eggs per gram of feces was also estimated as described by Seo et al. [2].
In the sample from Goryeong-gun, numerous eggs of T. trichiura (Fig. 2A, B) and C. sinensis (Fig. 2C, D) were detected, but only 2 eggs of Metagonimus spp. (Fig. 2E) were found. In the sample from Gwangmyeong-si, ova of T. trichiura (Fig. 3A, B) and A. lumbricoides (Fig. 3C–E) were detected. The size of helminth eggs detected and the number of eggs per a gram of feces (EPG) were designated in Table 1 in detail.
DISCUSSION
For the past decades, we have estimated Joseon parasite infection rates based on the study of mummy coprolite specimens. Until the present study, the number of mummy cases utilized in this way was 24 [2]. In this report, we added the data of 2 Korean mummies to the existing data pool of ancient parasite eggs. The areas surveyed in this study (Goryeong-gun and Gwangmyeong-si) are the ones where there have been no reports of ancient parasites from the Joseon Dynasty mummies.
Current report showed that the Joseon A. lumbricoides and T. trichiura infection rates are 57.7% (15/26) and 84.6% (22/26), respectively. In 1971 national survey data [9], the infection rates of A. lumbricoides and T. trichiura were 54.9 and 65.4%, respectively. In the case of C. sinensis, the eggs were found in 26.9% (7/26) of the Joseon mummies. This is much higher than the 4.6% infection rate of C.sinensis in the 1971 national survey [2,9]. As seen in our previous studies [2,10], we found that the overall rates of A. lumbricoides, T. trichiura, and C. sinensis decreased dramatically from Joseon to the modern period. We also note that Goryeong mummy is the 4th Joseon case to show Metagonimus spp. infection. The previous mummy cases of Metagonimus spp. infection were discovered at Sapgyo-eup (eup=town), Hadong-gun, and Sacheon-si in Korea [11]. Since ancient Metagonimus spp. eggs has rarely been detected in archaeological samples, this finding is meaningful to archaeoparasitologists.
Despite the achievements in our report, we cannot help but admit that there is still a technical limit to this study. For instance, the reported number of Joseon mummies is increasing every year, but it is still difficult to say that enough parasitic investigations have been conducted on them. In addition, molecular biological analysis has not been performed on ancient parasite eggs in this report, which we hope to take other opportunities to try.
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