Clinical signs associated with infection are nonspecific and may include appetite loss, uncoordinated swimming, lethargy, coelomic distention, darkening skin color, petechiae, fin erosion, and death.
en.wikipedia.org The catarrhal stage begins with a nonspecific rhinitis, which progresses into purulent, fetid rhinorrhea, and crusting, which can last for weeks or even months.
en.wikipedia.org The diagnosis can include dark-field or fluorescent microscopy of lesion; however, fifty percent of patients will be negative by nonspecific serology.
en.wikipedia.org However, the course can begin with other nonspecific symptoms, such as tiredness.
en.wikipedia.org Acute membranous laryngitis, a condition resembling acute membranous tonsillitis, is caused by pyogenic nonspecific organisms.
en.wikipedia.org