After five or six weeks, the larva matures to the adult worm. Both eggs and proglottids are passed in the stool. The eggs develop in 2 weeks, and hatch to become ...Home|ContactUs                                       DiphyllobothriumlatumCommonname.broadtapeworm,fishtapewormDisease.diphyllobothriasisGeographicdistribution.Thedistributionofthiswormisworldwide,especiallyinnorthernItaly,Switzerland,Germany,Balticcountries,Finland,Sweden,centralSiberia,NorthAmerica,northernManchuria,Japan,Korea,andChile.Infectionrate.Thecasereportsorincreasedoutbreakshavebeenreportedintheabovecountries.Lifecycle.Infectionwiththeadultwormisacquiredbytheingestionofraw,poorlycooked,orpickledsalmon,trout,perch,pike,whitefish,grayling,ruff,eel,etc.,harboringtheplerocercoidlarvae.Afterfiveorsixweeks,thelarvamaturestotheadultworm.Botheggsandproglottidsarepassedinthestool.Theeggsdevelopin2weeks,andhatchtobecomeciliatedcoracidiumlarvae,andareingestedbythefirstintermediatehost,thecopepod.Thecopepods,containingtheprocercoidlarvae,areingestedbyfish,thesecondintermediatehost,containstheplerocercoidlarvae.Morphology.Theadultwormreachesupto10mwith3,000proglottids.Thescolexiselongatedandspoonshapedwithtwolongsuckinggrooves.Itmeasures1mminwidthby2.5mminlength.Thematureandgravidproglottidsarebroaderthanlong,withthetypicalrosette-shapeduterus.Theymeasureupto2cminwidth.Theeggsareovalandoperculated.Theymeasure65～70by45～50㎛.Pathologyandclinicalsymptoms.Symptomsdependonthemassoftheworm,amountofitsby-productsabsorbedbythehost,andthehost'ssusceptibilitytotheforeignsubstances.Someinfectedpeopleshownosymptoms.Theremaybeintestinalobstruction,diarrhea,abdominalpain,oranemia.Diagnosis.Diagnosisisbasedontherecoveryofthecharacteristiceggsorproglottids.Proglottidsareoftenpassedinchainsinafewcmorlonger.Theproglottidmorphologywiththerosette-shapeduterusconfirmsthespecies.Prevention.Avoidingestionofraworundercookedsalmon,trout,perch,andpike.Suk-IlKimEggofD.latumfromhuman.Woon-MokSohnEggofDiphyllobothriumlatumfromhuman.Wo