Increasing prevalence of <i>Diphyllobothrium</i> cestodes in seals from the North and Baltic Sea over 26 years.

Discussion For the first time, the infection dynamics of potentially zoonotic intestinal helminths and an increasing trend in prevalence over a 26-year period in two seal species inhabiting a heavily anthropogenically used and densely populated coastal area are reported.

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Results and discussion A highly significant increase in cestode prevalence over the 26-year study period was revealed in harbor seals from the North Sea, with prevalences of 0–14% between 1996 and 2012 and 9–36% from 2013 to 2021.

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