Flavobacterium indologenes infection in leopard frogs

Area of Science:

• Veterinary Medicine
• Amphibian Pathology
• Microbiology

Background:

• Infectious diseases can significantly impact captive animal populations.
• Understanding disease dynamics in amphibians is crucial for conservation and research.
• Bacterial septicemia poses a threat to frog health.

Purpose of the Study:

• To investigate an infectious disease outbreak in a Rana pipiens colony.
• To identify the causative agent of the observed frog epidemic.
• To elucidate the transmission dynamics of the identified pathogen.

Main Methods:

• Clinical examination of affected frogs (Rana pipiens).
• Bacteriological isolation and identification from tissues and blood.
• Experimental inoculation of healthy frogs with the isolated bacterium.
• Controlled water system experiments to assess transmission.

Main Results:

• Six out of 40 frogs exhibited symptoms including weight loss, edema, and respiratory distress.
• Lesions were consistent with bacterial septicemia.
• Flavobacterium indologenes was isolated from sick frogs and confirmed as the causative agent through experimental inoculation.
• Disease did not develop in frogs exposed to contaminated water without a direct portal of entry.

Conclusions:

• Flavobacterium indologenes caused an epidemic of bacterial septicemia in Rana pipiens.
• Successful infection requires both sufficient bacterial load and a portal of entry.
• Continuous water flow systems may facilitate disease spread in susceptible amphibian populations.