title: Cryptic diversity in hymenolepidid tapeworms infecting humans.
abstract: An adult hymenolepidid tapeworm was recovered from a 52-year-old Tibetan woman during a routine epidemiological survey for human taeniasis/cysticercosis in Sichuan, China. Phylogenetic analyses based on sequences of nuclear 28S ribosomal DNA and mitochondrial cytochrome c oxidase subunit 1 showed that the human isolate is distinct from Hymenolepis diminuta and Hymenolepis nana, the common parasites causing human hymenolepiasis. Proglottids of the human isolate were unfortunately unsuitable for morphological identification. However, the resultant phylogeny demonstrated the human isolate to be a sister species to Hymenolepis hibernia from Apodemus mice in Eurasia. The present data clearly indicate that hymenolepidid tapeworms causing human infections are not restricted to only H. diminuta and H. nana.
authors.affiliation: Department of Parasitology, Asahikawa Medical University, Asahikawa, Japan.
authors.forename: Agathe
authors.initials: A
authors.lastname: Nkouawa
authors.affiliation: Finnish Museum of Natural History Luomus, University of Helsinki, Helsinki, Finland.
authors.forename: Voitto
authors.initials: V
authors.lastname: Haukisalmi
authors.affiliation: Institute of Parasitic Diseases, Sichuan Center for Disease Control and Prevention, Chengdu, China.
authors.forename: Tiaoying
authors.initials: T
authors.lastname: Li
authors.affiliation: Department of Parasitology, Asahikawa Medical University, Asahikawa, Japan. Electronic address: nakao@asahikawa-med.ac.jp.
authors.forename: Minoru
authors.initials: M
authors.lastname: Nakao
authors.affiliation: Department of Bacteriology and Immunology/Immunobiology Program, Faculty of Medicine, University of Helsinki, Helsinki, Finland.
authors.forename: Antti
authors.initials: A
authors.lastname: Lavikainen
authors.affiliation: Institute of Parasitic Diseases, Sichuan Center for Disease Control and Prevention, Chengdu, China.
authors.forename: Xingwang
authors.initials: X
authors.lastname: Chen
authors.affiliation: Natural Resources Institute Finland (Luke), Vantaa, Finland.
authors.forename: Heikki
authors.initials: H
authors.lastname: Henttonen
authors.affiliation: Department of Parasitology, Asahikawa Medical University, Asahikawa, Japan.
authors.forename: Akira
authors.initials: A
authors.lastname: Ito
mesh_terms: D000818:Animals; D002681:China; D005260:Female; D006801:Humans; D006925:Hymenolepiasis / Q000469:parasitology*; D006926:Hymenolepis / Q000145:classification* / Q000235:genetics* / Q000302:isolation & purification; D008875:Middle Aged; D010063:Ovum; D010802:Phylogeny
keywords: Cryptic species complex; Hymenolepiasis; Hymenolepis diminuta