Identification of a previously unidentified endemic region for taeniasis in North Sumatra, Indonesia.

In North Sumatra, Indonesia, taeniasis has previously been reported solely from Samosir Island located in Lake Toba. In 2014, however, three individuals were identified with taeniasis after voluntarily reporting for treatment, stimulating a subsequent investigation conducted in 2017. This investigation indicated that a previously unidentified endemic area exists in Simalungun District. Molecular analysis showed the worms to be hybrid-derived descendants of Taenia asiatica and Taenia saginata, which is consistent with specimens identified previously from Samosir Island.