ANS :The analytical profile index or
API is a classification of bacteria based on
experiments, allowing fast identification. This system is developed
for quick identification of clinically relevant bacteria. Because
of this, only known bacteria can be identified.
A dichotomous key is a common tool used by
biologists and other naturalists to categorize an unknown
organism. This “key” is a series of questions or
statements asking about a specific characteristic of the
organism.
The reasons for accurate identification of pathogenic bacteria
are:
- Interpretation of antibiotic susceptibility testing often rests
on identification. Two different bacteria may give the same values
on this test, but the definitions of susceptible and resistant are
different in different species.
- Some species can be notoriously difficult to eradicate by
treatment, and require long term use of antibiotics. Without
identifying the pathogen, you can’t predict this.
- Some species are intrinsically resistant to certain
antibiotics. In such isolates, even if the susceptibility testing
results suggest that the organism is sensitive to the antibiotic in
question, that antibiotic will be useless in treatment. So, certain
antibiotics are automatically reported as resistant in such cases.
Without knowing the identity of the isolate, such predictions are
impossible.