Case #172 – January 2006
This was a case of diphyllobothriasis, caused by a cestode in the genus, Diphyllobothrium. Diagnostic morphologic features included:
- a stroblia consisting of proglottids that were broader than they were long.
- centrally located genital pores (Figure C, red arrow) and rosette-shaped uteri (Figure C, green arrows). These features ruled-out Taenia sp.
- operculated eggs (Figure F, blue arrow) within the size range for Diphyllobothrium spp.
DNA was extracted from a few proglottids and a fragment of approximately 2100 base pairs was amplified by PCR from the Diphyllobothrium 18S rRNA gene. DNA sequencing analysis was performed on the amplified fragment, and the sequence showed 99% similarity with Diphyllobothrium latum 18S rRNA sequence deposited in GenBank under accession number DQ316793.
More on: Diphyllobothriasis
This case was kindly contributed by the Florida Department of Health.
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