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Background  Clonorchiasis is the common parasitic infection in the general population of the Republic of Korea, however, taeniasis is scarcely reported recently. Here, we describe a case of co-infection with the cestode  T. saginata  in a patient with subclinical clonorchiasis diagnosed by a combination of diagnostic tools in Korea.    Case presentation  A 56-year-old man visited the hospital having passed proglottids in his stool for the past two months and brought a stool sample with segments to our hospital. He had no abdominal symptoms, such as nausea, vomiting, abdominal pain, diarrhea, or constipation. He used to consume raw beef and fish frequently. We could not find evidence of gravid proglottids which contain fully developed uteri filled with ova or branched uterine structures, within the submitted sample. To identify the tapeworm species, we carried out molecular analyses on the proglottids. The  cox1  and  ef1a  sequences had a 100% match with those of  T. saginata  and differed from the sequences of the other  Taenia  species. Upon examination of stool samples fixed by formalin-ether concentration method, no  Taenia  species ova were observed in 10 slides. Instead,  C. sinensis  ova were observed, despite the level of IgG specific to  C. sinensis  being within the normal range. The patient was treated with praziquantel (25 mg/kg, three times a day) for 3 days, and subsequently  C. sinensis  ova were not found in his stool.    Conclusion  Our case indicates that a combination of morphological, serological, and molecular diagnostic tools should be used for the accurate diagnosis of subclinical parasitic infections.    Electronic supplementary material  The online version of this article (10.1186/s12879-019-3758-0) contains supplementary material, which is available to authorized users.

A co-infection case report of Taenia saginata in a patient with subclinical clonorchiasis confirmed by the combination of diagnostic tools