Regardless of the initial cause of illness or injury, neonatal psittacine birds often develop secondary bacterial and/or fungal infections that can become serious primary problems. These infections are most commonly encountered within the gastrointestinal tract.
The first step in antimicrobial drug selection is to make sure treatment is necessary. Companion birds often display nonspecific signs of illness, and the avian clinician should be reasonably sure that an infection is present before using antibiotics. The presence of a pathogen on culture or Gram stain does not necessarily mean treatment is warranted. Small numbers of potential pathogens are frequently isolated from the choana and cloaca of healthy birds.