{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,15]],"date-time":"2026-10-15T00:34:28Z","timestamp":1792024468949,"version":"4.4.0"},"reference-count":41,"publisher":"Cambridge University Press (CUP)","issue":"3","license":[{"start":{"date-parts":[[2006,6,2]],"date-time":"2006-06-02T00:00:00Z","timestamp":1149206400000},"content-version":"unspecified","delay-in-days":0,"URL":"https:\/\/www.cambridge.org\/core\/terms"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Parasitology"],"published-print":{"date-parts":[[2006,9]]},"abstract":"<jats:p>\n                    The transmission of\n                    <jats:italic>Ascaris suum<\/jats:italic>\n                    was studied in outdoor reared pigs. From May to June 2001, 6 farrowing paddocks were naturally contaminated with\n                    <jats:italic>A. suum<\/jats:italic>\n                    using experimentally infected seeder pigs. Early July, 1 sow farrowed on each paddock. One piglet per litter was slaughtered every second week starting at week 3\n                    <jats:italic>post-partum<\/jats:italic>\n                    (p.p.) for registration of liver white spots and recovery of\n                    <jats:italic>A. suum<\/jats:italic>\n                    from the lungs and the small intestine. The last pigs were slaughtered at week 19 p.p. Faeces was examined for parasite eggs and blood was analysed for\n                    <jats:italic>A. suum<\/jats:italic>\n                    -specific antibodies. Weaning took place at week 7 p.p. by removing the sow. Paddock infection levels were estimated by regular examination of soil samples and in late June and late November using parasite na\u00efve tracer pigs. Paddock contamination was high but eggs developed slowly resulting in a low initial transmission to the experimental pigs. By week 5 p.p. transmission had increased and the numbers of infective eggs in the soil increased during the study. The results indicate a continuous uptake of infective eggs, but visceral larval migration was reduced with time, probably due to the development of a pre-hepatic barrier. Nevertheless, a rather large population of adult worms remained in the pigs throughout the study, and it may primarily have been eggs ingested in the early infection phase that gave rise to the patent infections. It is suggested that neonatal exposure may result in increased persistence and size of adult worm burden and that the higher \u2018life-time worm burden\u2019 may be of significant economic importance.\n                  <\/jats:p>","DOI":"10.1017\/s0031182006000394","type":"journal-article","created":{"date-parts":[[2006,6,2]],"date-time":"2006-06-02T03:53:36Z","timestamp":1149220416000},"page":"305-312","source":"Crossref","is-referenced-by-count":25,"title":["<i>Ascaris suum<\/i>\n                    infections in pigs born and raised on contaminated paddocks"],"prefix":"10.1017","volume":"133","author":[{"given":"H.","family":"MEJER","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"A.","family":"ROEPSTORFF","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"56","published-online":{"date-parts":[[2006,6,2]]},"reference":[{"key":"S0031182006000394_ref025","doi-asserted-by":"publisher","DOI":"10.1111\/j.1365-3024.2005.00752.x"},{"key":"S0031182006000394_ref007","unstructured":"Coates, S. (2000).Modelling the population dynamics of Ascaris suum in pigs. Ph.D. thesis,Danish Centre for Experimental Parasitology, Copenhagen, Denmark and the University of Warwick,Coventry,UK."},{"key":"S0031182006000394_ref036","unstructured":"Stankiewicz, M. and Froe, D. L. (1995).Unabbreviated Ascaris suum immunizing infections of piglets lead to immunosuppression and increased numbers of intestinal parasites.Acta Parasitologica 40,152\u2013155."},{"key":"S0031182006000394_ref019","unstructured":"Kelley, G. W. and Nayak, D. P. (1965).Passive immunity to Ascaris suum transferred in colostrum from sows to their offspring.American Journal of Veterinary Research 26,948\u2013950."},{"key":"S0031182006000394_ref023","doi-asserted-by":"publisher","DOI":"10.1017\/S0031182006000382"},{"key":"S0031182006000394_ref024","doi-asserted-by":"crossref","unstructured":"Mejer, H. , Wendt, S. , Thomsen, L. E. , Roepstorff, A. and Hindsbo, O. (2000).Nose-rings and transmission of helminth parasites in outdoor pigs.Acta Veterinaria Scandinavica 41,153\u2013165.","DOI":"10.1186\/BF03549647"},{"key":"S0031182006000394_ref041","doi-asserted-by":"publisher","DOI":"10.1016\/0014-4894(88)90051-3"},{"key":"S0031182006000394_ref033","unstructured":"Roepstorff, A. and Nansen, P. (1998). The Epidemiology, Diagnosis and Control of Helminth Parasites of Swine .A FAO Handbook. FAO, Rome,Italy."},{"key":"S0031182006000394_ref035","doi-asserted-by":"crossref","unstructured":"Slotved, H.-C. , Barnes, E. H. , Eriksen, L. , Roepstorff, A. , Nansen, P. and Bj\u00f8rn, H. (1997).Use of an agar-gel technique for large-scale application to recover Ascaris suum larvae from intestinal contents of pigs.Acta Veterinaria Scandinavica 38,207\u2013212.","DOI":"10.1186\/BF03548483"},{"key":"S0031182006000394_ref004","doi-asserted-by":"publisher","DOI":"10.1017\/S0031182099004916"},{"key":"S0031182006000394_ref020","unstructured":"Kraglund, H.-O. (1999).Survival, development and dispersal of the free-living stages of Ascaris suum, Oesophagostomum dentatum and Trichuris suis at the pasture. Ph.D. thesis,the Royal Veterinary and Agricultural University,Copenhagen, Denmark."},{"key":"S0031182006000394_ref021","unstructured":"Krasnonos, L. N. (1978).Prolonged survival of Ascaris lumbricoides L., 1758 ova in the soil in Samarkand.Meditsinskaya Parazitologicya i Parazitarnye Bolezni 47,103\u2013105."},{"key":"S0031182006000394_ref027","unstructured":"Oksanen, A. , Eriksen, L. , Roepstorff, A. , Ils\u00f8e, B. , Nansen, P. and Lind, P. (1990).Embryonation and infectivity of Ascaris suum eggs. A comparison of eggs collected from worm uteri with eggs isolated from pig faeces.Acta Veterinaria Scandinavica 31,393\u2013398."},{"key":"S0031182006000394_ref038","doi-asserted-by":"publisher","DOI":"10.1016\/0020-7519(92)90007-8"},{"key":"S0031182006000394_ref012","doi-asserted-by":"crossref","unstructured":"Helwigh, A. B. and Nansen, P. (1999).Establishment of Ascaris suum in the pig: development of immunity following a single primary infection.Acta Veterinaria Scandinavica 40,121\u2013132.","DOI":"10.1186\/BF03547029"},{"key":"S0031182006000394_ref011","doi-asserted-by":"publisher","DOI":"10.2527\/jas1985.601220x"},{"key":"S0031182006000394_ref014","doi-asserted-by":"publisher","DOI":"10.1046\/j.1365-3024.1999.00261.x"},{"key":"S0031182006000394_ref018","doi-asserted-by":"publisher","DOI":"10.2307\/3275608"},{"key":"S0031182006000394_ref026","unstructured":"M\u00fcller, G. (1953).Untersuchungen \u00fcber die Lebendsdauer von Askarideneiern in Gartenerde.Zentrallblatt f\u00fcr Bakteriologie, Parasitenkunde, Infektionskrankheiten und Hygiene 159,377\u2013379."},{"key":"S0031182006000394_ref001","unstructured":"Alicata, J. E. (1935).Early developmental stages of nematodes occurring in swine.US Department of Agriculture Technical Bulletin 489,1\u201396."},{"key":"S0031182006000394_ref015","doi-asserted-by":"crossref","unstructured":"Jungersen, G. (2002).Immunity and immune responses to Ascaris suum in pigs. In The Geohelminths: Ascaris, Trichuris and Hookworm (ed. Holland, C. V. and Kennedy, M. W. ), pp.105\u2013124.Kluwer Academic Publishers.Boston, Dordrecht, London.","DOI":"10.1007\/0-306-47383-6_7"},{"key":"S0031182006000394_ref002","doi-asserted-by":"publisher","DOI":"10.1111\/j.1699-0463.1973.tb02256.x"},{"key":"S0031182006000394_ref008","doi-asserted-by":"crossref","unstructured":"Eriksen, L. , Lind, P. , Nansen, P. , Roepstorff, A. and Urban, J. (1992 a).Resistance to Ascaris suum in parasite na\u00efve and naturally exposed growers, finishers and sows.Veterinary Parasitology 41,137\u2013149.","DOI":"10.1016\/0304-4017(92)90017-4"},{"key":"S0031182006000394_ref003","unstructured":"Bernardo, T. M. , Dohoo, I. R. and Donald, A. (1990).Effect of ascariasis and respiratory diseases on growth rates in swine.Canadian Journal of Veterinary Research 54,278\u2013284."},{"key":"S0031182006000394_ref005","doi-asserted-by":"publisher","DOI":"10.1017\/S0031182098003382"},{"key":"S0031182006000394_ref006","doi-asserted-by":"publisher","DOI":"10.1016\/S0304-4017(02)00080-8"},{"key":"S0031182006000394_ref009","doi-asserted-by":"crossref","unstructured":"Eriksen, L. , Nansen, P. , Roepstorff, A. , Lind, P. and Nilsson, O. (1992 b).Response to repeated inoculations with Ascaris suum eggs in pigs during the fattening period. I. Studies on worm population kinetics.Parasitology Research 78,241\u2013246.","DOI":"10.1007\/BF00931733"},{"key":"S0031182006000394_ref010","doi-asserted-by":"publisher","DOI":"10.2307\/3285733"},{"key":"S0031182006000394_ref013","unstructured":"Jolie, R. , B\u00e4ckstr\u00f6m, L. , Pinckney, R. and Olson, L. (1998).Ascarid infection and respiratory health in feeder pigs raised on pasture or in confinement.Swine Health and Production 6,115\u2013120."},{"key":"S0031182006000394_ref016","doi-asserted-by":"crossref","unstructured":"J\u00f8rgensen, R. J. , Nansen, P. , Nielsen, K. , Eriksen, L. and Andersen, S. (1975).Experimental Ascaris suum infection in the pig. Population kinetics following low and high levels of primary infection in piglets.Veterinary Parasitology 1,151\u2013157.","DOI":"10.1016\/0304-4017(75)90017-5"},{"key":"S0031182006000394_ref017","doi-asserted-by":"publisher","DOI":"10.1016\/S0020-7519(99)00202-7"},{"key":"S0031182006000394_ref022","doi-asserted-by":"publisher","DOI":"10.1017\/S0031182099004503"},{"key":"S0031182006000394_ref028","unstructured":"Roepstorff, A. (2003).Ascaris suum in pigs: population biology and epidemiology. Doctorate thesis,the Royal Veterinary and Agricultural University,Copenhagen, Denmark."},{"key":"S0031182006000394_ref029","doi-asserted-by":"publisher","DOI":"10.1017\/S0031182097001480"},{"key":"S0031182006000394_ref030","unstructured":"Roepstorff, A. , J\u00f8rgensen, R. J. , Nansen, P. , Henriksen, S. Aa. , Skovgaard Pedersen, J. and Andreasen, M. (1992).Parasitter hos \u00f8kologiske svin (Parasites in organic swine).Project report, financed by the Danish Ministry of Agriculture.Landsudvalget for svin, Danske slagterier,Copenhagen."},{"key":"S0031182006000394_ref031","doi-asserted-by":"publisher","DOI":"10.1016\/S0020-7519(97)00022-2"},{"key":"S0031182006000394_ref032","doi-asserted-by":"publisher","DOI":"10.1016\/0304-4017(94)90084-1"},{"key":"S0031182006000394_ref034","unstructured":"Ron\u00e9us, O. 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