^Spirochaetes

 

Knowledge of the bacterial species present when dealing with an infectious condition will be very helpful in selecting an appropriate antimicrobial and therefore culture and sensitivity testing is often indicated. If this information is not available, a combination of cytology and a knowledge of which pathogens are likely for a given situation may help in selecting an appropriate antimicrobial. Cytology will allow classification of the bacteria present by Gram-staining and morphology, which will narrow down the possible species. Knowledge of the site of infection may suggest whether bacteria are likely to be aerobic or anaerobic, for example cases of pyothorax and abscesses are likely to involve obligate and facultative anaerobes.³

 

Type of organism

Spirochaetes

 

Possible bacterial pathogens⁴

Leptospira icterohaemorrhagiae (stain poorly as Gram-negative)

Borrelia burgdorferi (stain as Gram-negative, microaerophilic or anaerobic)

 

Useful antimicrobials^5,6

Tetracyclines

 

Key: Aerobic Anaerobic