Paleoparasitological Studies Research Articles

First report of a morulated Ascaridoidea (Nematoda) egg in an avian coprolite from the Paleogene of the Paraíba Valley, State of São Paulo, Brazil.

Ascaridoidea (Nematoda) is a widespread superfamily of nematodes that comprises gastrointestinal parasites from all major groups of vertebrates. Although this taxon probably emerged in the Carboniferous, its Brazilian fossil record includes mostly eggs, found in ancient remains, collected in paleontological and archeological sites from the Mesozoic and Cenozoic Eras. The Tremembé Formation (Oligocene of the Taubaté Basin) has become an important source for paleoparasitological studies in avian coprolites during the third decade of the 21st century, with reports of eggs only at only a single cell stage, of embryonic development. Here we present the first egg of Ascaridoidea preserved containing morula, from a bird coprolite recovered from the shales of the Tremembé Formation. Three coprolites, from the outcrop of Aligra Comércio de Argila S/A, Taubaté municipality (State of São Paulo), were rehydrated and subjected to spontaneous sedimentation. Based on morphological and morphometric features and diet and zoopaleontological context, the trace fossils were assigned to piscivorous birds. The egg found showed morphological characteristics typical of Ascaridoidea: namely spherical form, ornamented, and somewhat thick shell. Moreover, this superfamily includes several taxa that infect piscivorous birds and fish in heteroxenous life cycles and produce eggs with similar features as the egg found in the present study. The paleoparasitological information associated with the paleofaunistic diversity of birds and fish from the Tremembé Formation, reveal that the ancient Brazilian paleoenvironments provided subsidies for the rise and success of nematodes infecting these animals during the Paleogene.

Ancient parasite infections from the main Pampean-Patagonian cemetery of hunter-gatherer of prehistoric times: Archaeological site Chenque I (Parque Nacional Lihué Calel, La Pampa Province, Argentina)

Paleoparasitological studies of human sediment samples from prehistoric times of Argentina are scarce. The objective of the present study is to enhance the knowledge of parasitic infections affecting hunter-gatherer populations inhabiting the Pampean region of Argentina in prehistoric times. A total of 33 samples from 12 inhumation structures of archaeological site Chenque I, the unique cementery studied in Argentina until now from a paleoparasitological point of view, were studied. Chenque I constitute the greater repository of human archaeological remains of La Pampa province. Thirty-one samples came from human burials, and 2 samples from a dog retrieved in a burial, associated with a child. By humans, 11 samples correspond to males, 13 to females, and 7 to undifferentiated individuals. A total of 5 samples corresponds to control samples and were taken under the skull. Paleoparasitological examination revealed that 8 of the 33 sediment samples resulted positive for parasite remains applying the rehydration and spontaneous sedimentation technique with or without addition of HCl (10%). The pre-treatment of samples with HCl as a preliminary step allowed a greater recovery of parasitic remains compared to standard spontaneous sedimentation procedure. The most common parasite species found was Trichuris trichiura being probably one of the parasites that commonly affect human populations inhabiting the region. The low preservation evidenced by the parasite remains recovered indicate a taphonomic interference in the data of parasite assemblages, which probably produce a bias in the recovery of other parasite species that could infect these ancient populations. Proceed in the study of new human samples to improve the knowledge of parasitic infections affecting ancient populations inhabiting the studied region is necessary.

Continuity in intestinal parasite infection in Aalst (Belgium) from the medieval to the early modern period (12th-17th centuries)

ObjectiveTo characterize patterns in the taxonomic diversity of parasites infecting the population of Aalst, Belgium, between the 12th and 17th centuries. Materials14 sediment samples from seven cesspits dated 1100–1700 CE. MethodsDigital light microscopy and Enzyme-linked immunosorbent assay (ELISA). ResultsWe identified eggs of four species of helminths: whipworm (Trichuris trichiura), roundworm (Ascaris lumbricoides), Echinostoma fluke and Dicrocoelium fluke. ELISA results for protozoal parasites were negative. ConclusionsTaxonomic diversity of parasite infections remained constant from the 12th to the 17th centuries. Roundworm and whipworm, spread by poor sanitation, were dominant. Two species of zoonotic parasites were also identified, including for the first time ever in the Low Countries the Echinostoma fluke, which may have been spread by eating uncooked freshwater animal foods. SignificanceAnalysis of sediment samples spanning such a broad chronology (six centuries) from a single city offers the opportunity to track diachronic change, which is rare in paleoparasitological studies. LimitationsWe were unable to acquire samples from cesspits dating to the 14th century. Suggestions for further researchAdditional data from other Low Countries towns may strengthen the patterns identified in this paper. A similar approach can be used to investigate towns in different regions of the world.

Paleogenetic and microscopic studies of Eimeria spp. (Apicomplexa: Eimeriidae) as a tool to reveal the zoological origin of coprolites: The case of study of artiodactyl coprolites from an archeological site from Patagonia, Argentina

Coprolites are one of the sources of evidence most commonly used in paleoparasitological studies. However, the zoological origin identification is not always possible. Parasites of the genus Eimeria (Apicomplexa: Eimeriidae) are obligate protozoan which have evolved to exhibit a great diversity of host range, and present strict host specificity. Usually, the identification of Eimeria spp. can be done by morphological characteristics such as size and shape of the oocysts. Moreover, molecular diagnostic methods such as PCR have proven to be very useful methodologies for an accurate taxonomic identification. In recent years, molecular techniques have started to be applied in paleoparasitological studies. Here, we provide the first integrative approach that combine light microscopic studies and ancient DNA (aDNA) in order to detect and identify Eimeria spp. on artiodactyl coprolites recovered from an archeological context from northwestern Patagonia, Argentina. The main objective is to discuss the advantages of complementing these two approaches as a promising tool to identify the zoological origin of coprolites. Furthermore, we provide paleoparasitological data about the presence of Eimeria spp. in coprolites of South American ungulates. Light microscopic studies allowed the identification of oocysts attributed to Eimeria spp. in 13 of the 40 coprolites. Amplification and sequencing of the aDNA ITS1 detected the presence of Eimeria spp. in 5 of the 10 samples, and allowed the taxonomic identification of these sequences as belonging to Eimeria arloingi. Furthermore, the results obtained from cytochrome b gene (Cytb) analysis confirmed the identity of the host as Capra hircus. Results displayed the presence of coccidiosis in goats from historical times. This study highlights that both techniques are complementary and promotes the use of the identification of Eimeria spp. in ancient samples in order to identify the zoological origin.

Occurrence of Taeniidae in a Middle Pleistocene speleothem of the Bàsura cave (Toirano, Liguria, Italy)

ObjectiveThis study aims to (i) analyse whether speleothems may contain fossil parasitic worm eggs and, if so, (ii) identify the pathogens involved, and (iii) place them in geological, palaeontological, and chronological contexts to know the zoonoses that could affect human and animal populations during the Middle Pleistocene. MaterialsA sample of calcite dated to the beginning of MIS 9 and MIS 8 from the Bàsura cave (Liguria, Italy) was analysed. MethodsThe chemical protocol applied is characterised using hydrochloric acid, the reduction of hydrofluoric acid application time, and by the absence of the use of base, dense liquor or acetolysis. ResultsAn embryophore of a taeniid was recovered. ConclusionsEndoparasitic worm eggs can be found in speleothems. A taeniid embryophore was found in a calcite level dated to MIS 9. Zoonoses related to the Taeniidae family existed 300,000 years ago in the northern Mediterranean region and may have affected Middle Pleistocene predators, carnivores, or humans. Speleothems are good tools for paleoparasitological studies. SignificanceThis is the oldest taeniid recovered and identified. LimitationsA more precise determination of the genus of this taeniid is not possible in the absence of more precise palaeontological data. Suggestions for further researchAn application of this approach to other Pleistocene speleothems could broaden the spectrum of parasites and their zoonoses over remote Pleistocene periods.

Parasites in the Atacama Desert: New insights into the lifestyles of ancient human populations (3000–500 BP)

Paleoparasitological studies have provided insights into ancient parasite occurrence and its relationship to the health, lifestyle, and cultural practices of past populations. We analyzed 26 human coprolites and digestive tract contents, most of them contained in mummified human bodies, from coastal and inland archaeological sites in the Atacama Desert (3000–500 BP), to test for gastrointestinal parasites. We rehydrated and sedimented the samples to concentrate the micro-remains and then conducted light microscopy examination and paleogenetic analysis. The microscopy analysis allowed us to recover helminth eggs of five different taxa in seven samples, attributed to Diphyllobotrium sp., Dipylidium caninum, Enterobius vermicularis, Trichuris sp., and possible strongylid. PCR amplification yielded negative results in all cases. Results suggest a low parasite burden relating to infection with pinworms, whipworms, and possible strongylids, as well as an absence of infection in most of the individuals. The presence of Diphyllobotrium sp. in coastal sites is associated with the consumption of insufficiently cooked fish resources. The occurrence of D. caninum in an inland site may indicate cohabitation with dogs and/or wild canids. These findings contribute to knowledge of parasite occurrence in human groups from the southern Andes and its relationship with the environment and the cultural practices involved.

Gastrointestinal parasite burden in 4th-5th c. CE Florence highlighted by microscopy and paleogenetics.

The study of ancient parasites, named paleoparasitology, traditionally focused on microscopic eggs disseminated in past environments and archaeological structures by humans and other animals infested by gastrointestinal parasites. Since the development of paleogenetics in the early 1980s, few paleoparasitological studies have been based on the ancient DNA (aDNA) of parasites, although such studies have clearly proven their utility and reliability. In this paper, we describe our integrative approach for the paleoparasitological study of an ancient population from Florence in Italy, dated to the 4th-5th c. CE. The first stage consisted in the study of sediment samples from the pelvic area of 18 individuals under light microscopy. This allowed us to detect Ascarid-type eggs belonging very probably to the human-infesting roundworm Ascaris lumbricoides. Ten subsamples were selected corresponding to five individuals, and we extracted their whole DNA following sediment aDNA protocols. A targeted approach allowed us to detect two nematodes and one trematode aDNA fragments, namely Ascaris sp., Trichuris trichiura, and Dicrocoelium dendriticum. Among the five individuals tested for microscopic eggs and aDNA, three of them showed the remains of eggs (only Ascarid-type), but all of them tested positive to the presence of at least one parasite aDNA. Microscopic diagnosis first guided our research for the selection of promising samples while the targeted aDNA approach significantly improved our knowledge in terms of parasitic diversity and frequency in this population subgroup. These results enabled us to discuss the possible impact of latent parasitism in this past population at the time of an epidemic, as suggested in Florence. In particular, the singular case of D. dendriticum detection is discussed in light of the present-day scarcity of genuine human infections. Nevertheless, actual infections are known in the paleoparasitological record, and food habits may have led to false parasitism in this historical context. aDNA leaching from overlying strata may also explain this detection. This study strongly pleads for a systematic integrative approach combining microscopy and aDNA in paleoparasitology.

Macroparasites of megamammals: The case of a Pleistocene-Holocene extinct ground sloth from northwestern Patagonia, Argentina

Sloths and ground sloths (Xenarthra: Tardigrada) are among the most conspicuous mammals in the Cenozoic faunas of South America. During the late Pleistocene and the early Holocene, all the megafaunal xenarthrans became extinct. While much attention has been paid to understanding the causes of megafauna extinction, less attention has been given to understanding the impacts of the loss of the megafauna on other organisms with whom they interacted. Paleoparasitology offers the opportunity to look back into the past and observe directly how parasites responded to environmental change and host decline events. The present work is the first paleoparasitological study on megaherbivores dung from the archaeological site Cueva Huenul 1 (northwestern Patagonia, Argentina). Twenty one dung samples were examined for parasites. Samples were processed by rehydration in a 0.5% water solution of trissodium phosphate, followed by homogenization, filtered and processed by spontaneous sedimentation. Additionally, microhistological analyses of three samples were made. The dung samples were identified as belonging to a ground sloth. Ground sloths from northwestern Patagonia were infected by the nematodes Trichostrongylus sp., Nematodirus sp., at least three Strongylida-type species, Trichuris sp., one ascaridid and one unidentified nematode. Also, the results indicated that the diet was mainly based on shrub species (Schinus johnstonii, Prosopis sp., Berberis empetrifolia, Ephedra chilense and Retanilla patagonica), typical of the Monte vegetation. Also, the cacti Maihuenia and the grasses Festuca kurtziana, Hordeum comosum, Stipa speciosa and Poa sp. (Family Poaceae) were found but in less frequency. The host-parasite-environment interactions, the potential parasitic diseases and ecological consequences of the ground sloth extinction are discussed. This study shows the potential of paleoparasitological studies of ancient feces to contribute to the understanding of the evolutionary histories of parasites and hosts.

Paleopathological Research in Southern Patagonia: An Approach to Understanding Stress and Disease in Hunter-Gatherer Populations

This article reviews the most relevant data regarding evidence of stress and disease in native populations from Southern Patagonia and proposes future directions for paleopathological research. It focuses on the disease patterns in hunter-gatherer societies and the changes produced by contact and colonization. Studies of oral pathologies show a high frequency of dental attrition and low frequency of caries and antemortem tooth loss. Individuals with terrestrial dietary patterns show evidence of higher mechanical stress in the spine than those who participated in marine economies, based on the prevalence of Schmorl's nodes and vertebral osteophytosis. Porotic hyperostosis is more prevalent in individuals who had a marine diet and is probably related to nutritional impairment and parasitic infections. A higher frequency of metabolic stress was identified in individuals who lived in missions, perhaps because of declining quality in diet, hygiene, and living conditions. Paleoparasitological studies identified several species of parasites associated with human skeletons and terrestrial fauna. Moreover, recent studies suggested that treponematosis and tuberculosis were present in Patagonia since at least 1000 years BP. Future paleopathological research should increase the size and quality of studied samples and apply new methods and interpretive criteria. Detailed research into infections, degenerative joint diseases, and trauma (including violence episodes) has rarely been conducted.

NEW PARASITE OCCURRENCES IN Tamandua tetradactyla (PILOSA: MYRMECOPHAGIDAE) IN THE NORTHEAST OF BRAZIL: A PALEOPARASITOLOGICAL STUDY

Paleoparasitological studies have revealed parasite eggs in coprolites from humans and other animals, obtained in archaeological sites in the New and Old World. However, to date, the only parasite found in anteaters coprolites is Gigantorhynchus echinodiscus (Acanthocephala: Gigantorhynchidae). Here we present the results of paleoparasitological analysis of nine Tamandua tetradactyla coprolites, of layers dated from 8,870 and 3,190 years BP, collected in three archaeological sites: Toca dos Coqueiros, Toca da Passagem and Toca do Enoque, rock shelters located in the southeast of the Piaui state, Brazil. Each coprolite was rehydrated in 0.5% trisodium phosphate solution, homogenized with a glass rod for spontaneous sedimentation. A minimum of 20 slides of each sample was examined using light microscopy. Acanthocephalan eggs of three morphotypes were found: G. echinodiscus, Macracanthorhynchus hirudinaceus and Oligacanthorhynchus sp.. Three morphotypes of Nematoda eggs and oocysts of cf. Entamoeba sp. were also found. The finding of G. echinodiscus , a species commonly reported in anteaters, reinforces the previous data and highlights the specificity and antiquity of this host-parasite interaction. This is the first finding of Oligacanthorhynchidae and Aspidoderidae parasites in T. tetradactyla. These findings evidence the need for more studies of the parasitic fauna of T. tetradactyla from both ancient and current times aiming to broaden the knowledge about the parasite diversity of this host and the evolutionary processes that led to these interactions.

Ancient Echinostome Eggs Discovered in Archaeological Strata Specimens from a Baekje Capital Ruins of South Korea

Echinostomiasis is prevalent in southeastern as well as northeastern Asian countries. This endemicity notwithstanding, no echinostome egg has as yet been reported by paleoparasitological studies conducted in Asian countries. Recently we analyzed geological-strata specimens retrieved from the ancient capital city of the Baekje Kingdom to uncover clues to the possible prevalence of echinostomiasis among contemporaneous populations of Korea. By means of archaeoparasitological technique, we found ancient Isthmiophora hortensis eggs in the specimens, thus revealing for the first time that ancient Korean people experienced isthmiophoriasis. Our report can be considered to have effectively broadened the spatial and temporal scope of research on echinostomiasis in human history.

Zoonotic parasites in feline coprolites from a holocenic mortuary context from eastern Patagonia (Argentina)

AbstractNowadays, wildlife is one of the most important sources of zoonoses, and it is a major concern for public health. Nevertheless, little is known about the role of wildlife as a reservoir and source of infectious diseases in the past. South America presents a wide diversity of wildlife. In the south of the continent, Argentina shelters a large diversity of neotropical carnivores. Although the paleoparasitological studies on carnivores have been increasing in southern Argentina, most of the efforts have been focused in a handful of sites located in western Patagonia. In this paper, two coprolites of felid found in Cueva Galpón, an initial late Holocene mortuary site from northeast Patagonia (Argentina), were studied for paleoparasitological purposes. Samples were processed by rehydration and homogenization, filtered and processed by spontaneous sedimentation. The samples were assigned to Puma concolor (puma) or Panthera onca (jaguar). Microscopic observations revealed that both coprolites were positive for parasite remains. High parasite richness was observed. Six nematodes, one cestode, and one coccidian morphotypes were reported. This is the first time that Gnathostoma sp. and Spirocerca sp. were recovered from holocenic times from Patagonia. This finding implies that some diseases such as taeniasis, spirocercosis, gnathostomosis, ascariasis, and coccidiosis could be present in holocenic wildlife from Patagonia prior to the Spanish colonization and domestic animal introduction. The overall results suggest that felids could have played a role as reservoirs and source of some parasitic species, some of which are zoonotic. Therefore, this animal could have entailed a risk agent for human health in the site.

Archaeoparasitological Strategy Based on the Microscopic Examinations of Prehistoric Samples and the Recent Report on the Difference in the Prevalence of Soil Transmitted Helminthic Infections in the Indian Subcontinent

Archaeoparasitology is a study to acquire data concerning the parasite infection of ancient people through the examination of the specimens obtained in the excavation sites. Although this research has achieved many successes worldwide, there has been few noteworthy reports from South Asia countries. In 2011 to 2016, we thus conducted parasite examinations on Indian archaeological specimens (n = 247) collected at excavation sites of Mature Harappan period (4600–3900 BP) and their contemporary rural Chalcolithic sites. To derive effective strategy of archaeoparasitological works in Indian Subcontinent, our data were analyzed together with previous clinical report on the soil transmitted helminth infection in the Indian Subcontinent. We propose that future paleoparasitological studies in India should be conducted more intensely on ancient specimens from the states of Assam, Bihar, Jammu and Kashmir, Tamil Nadu, Andhra Pradesh and West Bengal etc.

A novel approach: combining dental enamel hypoplasia and paleoparasitological analysis in medieval Islamic individuals buried in Santarém (Portugal)

Paleopathological and paleoparasitological studies seek evidences to understand health and disease in past populations. These two approaches are often used independently despite the obvious importance of its complementary. This paper aims to explore the possible relation between a common indicator of childhood stress and infection by intestinal parasites. Thirty adult individuals from the Islamic necropolis of Santarém (9th-12th cent. AD) were macroscopically examined for linear enamel hypoplasia. Sediment from the pelvis and skull of each skeleton were observed under the optical microscope in search of helminth eggs. Hypoplasic defects were identified in 46.67% of the individuals, mostly on canines and incisors. Eggs from Ascaris lumbricoides and Trichuris trichiura were identified respectively in 4 and 2 individuals. The Fisher’s exact test was performed to analyze whether the individuals with evidences of stress in early childhood were more prone to helminth infections or death at younger ages. Although these variables were shown to be independent, this exploratory study highlights the contribution of combining paleopathological and paleoparasitological methods to address the long-term impact of the physiological stress exposure in early life on the immune system. Furthermore, variety of factors that could have influenced these results are discussed and interpreted in a biocultural perspective.

New paleoparasitological investigations from the pre-inca to hispanic contact period in northern Chile

Paleoparasitological studies have demonstrated that changes in environment or culture are reflected in the patterns of parasitic infection diseases in populations worldwide. The advent of agriculture and animal domestication, with its accompanying reduction in human mobility and expanding population involves changes in or emergence of, parasites, the so-called first epidemiological transition. Cultural processes related to territory occupation contribute to both loss and acquisition of parasites. The archaeological site Lluta 57 in the Lluta Valley, Chile, provides a chronology of the transition from the pre-Inca or Late Intermediate Period (LIP), through the Late or Inca Period (LP), to the Hispanic Contact Period (HCP), providing the possibility of evaluating this epidemiological transition. The aim of this study was to conduct a paleoparasitological investigation of to gain insight into the dynamics of parasitism in Lluta people throughout the Inca expansion. Fourteen human coprolites from the three periods were rehydrated, submitted to spontaneous sedimentation, and examined by light microscopy for the presence of intestinal parasite eggs, pollen grains, and micro-remains. Eggs of four parasites: Enterobius vermicularis, Trichostrongylus sp., Trichuris sp., and Eimeria macusaniensis were recovered. Frequency, diversity, and number of parasite eggs per sample increased over the studied time period. Trichostrongylus sp. and E. macusaniensis were recorded in the region for the first time. Enterobius vermicularis eggs, absent in the LIP, were present as a hyper-infection in LP. The presence of E. macusaniensis is likely related to exploitation of llamas, which were used for food and transport and as sacrificial offerings. The paleobotanical analysis revealed ten families of pollen grains, as well as phytoliths and floral remains. In contrast to parasitological results, a diachronic pattern was not detected. Evolution of the settlements, with the advent of larger, more densely populated, villages, could have influenced the emergence and intensification of transmission of parasites in the region. The study showed that the Inca expansion influenced host-parasite-environment relationships in the Lluta Valley.

Historical Details about the Meat Consumption and Taeniases in Joseon Period of Korea.

Previous paleoparasitological studies of Joseon specimens established that the prevalence of Taenia infection was not much different from that of the early 20th century Korean population. As many of taeniases originally diagnosed as Taenia saginata in South Korea were revealed to be actually Taenia asiatica, which share a common intermediate host with T. solium (the pig), Joseon people must have ingested raw pork frequently. However, the current examination of extant Joseon documents revealed that the population ate significant amounts of beef even if the beef ban was enforced; and pork was not consumed as much as we thought. Considering the meat consumption pattern at that time, Joseon people should have been infected by T. saginata more frequently than T. asiatica. This may suggest a low prevalence of T. saginata metacestodes in cattle compared to that of T. asiatica metacestodes in pigs, possibly due to the traditional way of rearing pigs (using human feces). This letter gives us a chance to reconsider the existing preconception about parasitic infections in Korean history though we are still hard to accurately estimate the historical patterns of taeniases at this stage.

Detection Trend of Helminth Eggs in the Strata Soil Samples from Ancient Historic Places of Korea.

For several years, we have conducted a series of studies on the patterns of ancient parasitism prevailing in the soil of rural and urban areas of past Kingdom of Korea. Actually, during our survey of paleoparasitology in archaeological sites of Korean peninsula, numerous ancient parasite eggs were discovered in the samples from the city districts of Hansung (Joseon) and Buyeo (Baikje), the palace moat at Gyeongju (Silla), shell-midden site at Bonghwang-dong (Silla to Joseon), and the reservoir found in Hwawangsansung fortress (Silla). By the paleoparasitological studies, with respect to parasitism in the high-density populations of ancient towns and cities, we have managed to catch glimpses of the patterns prevalent therein: a serious parasitic contamination of the soil in ancient urban areas, but not in rural areas of the past. Our historical research also proposed the plausible mechanism of parasite infection very serious indeed among urban populations in Korean history. Although city dwelling doubtless has accrued significant benefits for people and populations with agriculture, it can be equally supposed that living in such highly populated areas might have facilitated the spread of parasite infection.

Recovery of Toxoplasma gondii DNA in experimentally mummified skin and bones: Prospects for paleoparasitological studies to unveil the origin of toxoplasmosis

Paleoparasitology studies parasite infections by finding the parasites’ remains in preserved organic remains such as natural or artificial mummy tissues, skeletons, teeth, and coprolites, among others. However, some currently important infections like toxoplasmosis have not been studied by paleoparasitology. The reasons include this parasite’s complex life cycle, the resulting difficulties in locating this protozoan in the intermediate host tissues, and the limitation of coprolite studies to felines, the protozoan’s definitive host. The current study thus aimed to produce an experimental model for molecular diagnosis of toxoplasmosis, prioritizing its study in bones and skin, the most abundant materials in archeological collections and sites. The study demonstrated the feasibility of recovering Toxoplasma gondii DNA from desiccated material, including bones and skin, in experimental models both with circulating tachyzoites (RH strain), characteristic of acute infection, and with cysts (ME49 cystogenic strain), characteristic of chronic infection. At present, most individuals with T. gondii infection are in the chronic phase, and the same was probably true in the past. The current study thus expands the odds of finding the parasite in archeological material, enhanced by the nature of the material in which the diagnosis was made. Finding the parasite may help answer questions that are widely debated in the literature on this protozoan’s origin (Old World versus New World). In addition, when conditions do not allow ideal storage of samples for molecular tests, the methodology creates the possibility of testing oven-dried samples transported at room temperature.

First study of fossil rodent middens as source of paleoparasitological evidences (northwestern Patagonia, Argentina)

The present paper reports the first paleoparasitological results obtained from coprolites of fossil rodent middens and demonstrates the potential of rodent middens as a source of paleoparasitological evidences in South America. Ten fossil rodent middens from northwestern Patagonia, Argentina, were studied. Five coprolites of each midden were fully processed, rehydrated, homogenized, subjected to spontaneous sedimentation, and examined through light microscopy. Eight of the 10 examined rodent middens contained parasite eggs. The eggs of parasites were assigned to Heteroxynema (Cavioxyura) viscaciae Sutton & Hugot, 1989 and Helminthoxys sp. (Nematoda: Oxyuridae), Trichuris sp. (Nematoda: Trichuridae) and one unidentified nematode. Fossil rodent middens were assigned to Lagidium viscacia (Caviomorph: Chinchillidae). The excellent preservation of parasite remains in coprolites from fossil rodent middens provided an opportunity to perform paleoparasitological inferences. The results of this papers demonstrates that fossil rodent middens offer an excellent opportunity for the recovery of parasite remains for future paleoparasitological studies in the southwest of South America.

Paleoparasitological evidence of pinworm (Enterobius vermicularis) infection in a female adolescent residing in ancient Tehran (Iran) 7000 years ago.

BackgroundThe Molavi street archeological site south of Tehran accidentally provided a unique opportunity for paleoparasitological studies in Iran. A female skeleton was unearthed and evaluated to be 7000 years old. Soil samples were collected around the pelvic and sacrum bones.FindingsCareful microscopic investigation of rehydrated soil samples revealed the presence of one Enterobius vermicularis egg attached to the skeleton sacral region.ConclusionThe present finding likely represents the oldest evidence of a human pinworm infection in Asia.