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Fant én meter lang bendelorm i ulvskit

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En rapportør gjorde et uvanlig funn i en ulveskit som skulle til Rovdata for DNA-analyse. I skiten lå en bendelorm på hele én meter!

– Bendelorm kan forekomme hos mange arter i norsk natur, men det er svært sjelden at vi observerer dem i skiten til de store rovdyrene. Vi har aldri før fått inn en skitprøve fra store rovdyr til DNA-analyse som har inneholdt bendelorm, sier Jonas Kindberg, leder i Rovdata.

Rovdata mottar og analyserer innsendte hår- og skitprøver på ulv for DNA, som er en viktig metode i overvåkingen av ulv i Skandinavia. 

Ikke uvanlig hos ulv

Ulveprøven med den slimete gjesten ble funnet i Hedmark av en privatperson i januar i år og levert inn til Høgskolen i Hedmark, som videresendte prøven til Rovdata. Bendelormen ble sendt til HD-diagnostikk for undersøkelser og artsbestemmelse.

– Prøvesvaret fortalte at dette var en bendelorm i slekten Taenia, men siden hodet manglet, lot den seg ikke nærmere artsbestemme. Dette er en type bendelorm som ikke er uvanlig i tarmen hos ulv og andre rovdyr. Hos ulv i Skandinavia finner man vanligvis typeneTaenia hydatigena og Taenia krabbei, og ingen av dem gir sykdom hos mennesker, selv omT. hydatigena i enkelte tilfeller har gitt infeksjon, sier Bjørnar Ytrehus, veterinær i Norsk institutt for naturforskning (NINA).

Bendelormen Taenia hydatigena kan bli hele fem meter lang. Dette er imidlertid kort i forhold til menneskets bendelorm, T. saginata, som kan bli 15 meter (!).

Viktig å melde fra

Selv om bendelormene Taenia hydatigena og Taenia krabbei ikke er farlige for mennesker, er det likevel viktig å melde fra om funn av parasitter i avføring fra ulv og andre dyr, slik at de kan bli undersøkt nærmere.

– Da kan vi undersøke om det finnes spor etter bendelormen Echinococcus multilocularis(dvergbendelorm), som gir mye mer alvorlig sykdom hos mennesker. Denne varianten har vi foreløpig ikke i Norge, men den har forekommet i ekstremt sjeldne tilfeller hos rødrev i Sverige, forteller Ytrehus. Ormen er aldri blitt påvist hos skandinavisk ulv, verken i Norge eller Sverige.

Husk plastpose!

Rovdata oppfordrer alle som samler inn skitprøver etter de store rovdyrene i Norge for DNA-analyser om å ikke være i direkte kontakt med skiten.

– Bruk en plastpose for å plukke den opp og oppbevar den kaldt til du får levert den til den lokale rovviltkontakten i Statens naturoppsyn (SNO). Rovviltkontakten vil videresende prøven til Rovdata for DNA-undersøkelser, forklarer Kindberg.

Funnet i kjent ulverevir

Denne aktuelle prøven ble funnet i Kynnareviret, som er et kjent ulverevir i Hedmark. Ulven som bar på bendelormen bærer navnet V569, og er trolig ny ledertispe i Kynna.

– Tispa er registrert gjennom en lang rekke DNA-prøver det siste året, men uten spor etter bendelorm. Trolig har den båret på bendelormen uten å merke noe til den, avslutter Kindberg.

 

Fakta om bendelorm-slekten Taenia:

  • Er ikke uvanlig hos ulv og andre rovdyr.
  • Hos ulv i Skandinavia finner en i regelen Taenia hydatigena og Taenia krabbei.
  • De lever i tarmen hos rovdyrene og sender ut kroppsledd fylt med egg.
  • Når leddene spises av mellomverter som husdyr og hjortedyr, klekkes eggene og små larverer invaderer blodkar i tarmene.
  • I blodkarene transporteres larvene rundt til de setter seg fast i en kapillær.
  • Her danner de en blære, en såkalt cysticercus. Disse kan skape problemer hvis de dannes på uheldige steder (omtrent som en godartet svulst)
  • Hos mellomverten finnes T. hydatigena oftest i bukhulen eller i leveren, mensT. krabbei finnes i skjelett- eller hjertemuskulaturen.
  • Hverken Taenia hydatigena eller Taenia krabbei gir sykdom hos mennesker, selv om T. hydatigena i enkelte tilfeller har gitt infeksjon.

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