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Background   Brucella  is a group of bacteria that causes brucellosis, which can affect population health and reproductive success in many marine mammals. We investigated the serological prevalence of antibodies against  Brucella  bacteria in a declining harbor seal population in Glacier Bay National Park, Alaska.    Results  Prevalence ranged from 16 to 74 percent for those tests detecting antibodies, indicating that harbor seals in Glacier Bay have been exposed to  Brucella  bacteria. However, the actual level of serological prevalence could not be determined because results were strongly assay-dependent.    Conclusions  This study reinforces the need to carefully consider assay choice when comparing different studies on the prevalence of anti– Brucella  antibodies in pinnipeds and further highlights the need for species- or taxon-specific assay validation for both pathogen and host species.

Assay dependence of Brucella antibody prevalence in a declining Alaskan harbor seal (Phoca vitulina) population