A case report highlights a diagnostic challenge in identifying Bordetella species. An infant presented with respiratory symptoms, initially testing positive for pertussis via PCR. However, further investigation using whole-genome sequencing revealed the causative agent to be Bordetella bronchiseptica, a pathogen more commonly associated with animals, not Bordetella pertussis. This misidentification could lead to inappropriate treatment and public health interventions. The case underscores the limitations of molecular diagnostics for closely related species and the importance of confirmatory methods to prevent diagnostic confusion and ensure accurate patient management.
Key note: Molecular diagnostics, while sensitive, can misidentify closely related bacterial species, necessitating advanced methods like WGS for accurate pathogen identification and appropriate clinical action.