Circular whitish granular lesions, 5-12 mm in diameter, were observed on the skin and fins of a wild northern pike, Esox lucius, caught in a lake in the Republic of Ireland. Histological examination of the lesions revealed hypertrophied cells in the epidermis with deeply basophilic enlarged nuclei and dark-staining granular material in the cytoplasm. Transmission electron microscopy of these cells revealed naked hexagonal herpes-like virus nucleocapsids (97 +/- 7 nm) in their nuclei while the cytoplasm contained multiple aggregates of enveloped viral particles. This is the first report of herpes-like virus particles in northern pike originating outside North America, where esocid herpesvirus-1 (EsHV-1) has previously been reported. Shared clinical, histological, morphological and epidemiological findings suggest that the observed particles in this report may also be EsHV-1.
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