Devriesea agamarum causes dermatitis in bearded dragons (Pogona vitticeps)

Area of Science:

• Veterinary Microbiology
• Herpetology
• Bacterial Pathogenesis

Background:

• Devriesea agamarum is commonly found in lizard dermatitis, especially cheilitis in Uromastyx.
• The bacterium's role as a causative agent of dermatitis requires further investigation.

Purpose of the Study:

• To fulfill Koch's postulates and confirm Devriesea agamarum as a causative agent of dermatitis in lizards.
• To assess the prevalence of D. agamarum in both diseased and healthy squamate species.

Main Methods:

• Isolation and identification of D. agamarum from diseased lizards across various species.
• Screening of healthy lizards (Pogona vitticeps, Uromastyx spp.) and eggshells for D. agamarum presence.
• Experimental inoculation of bearded dragons (P. vitticeps) with D. agamarum to induce and re-isolate the bacterium from induced dermatitis.

Main Results:

• D. agamarum was isolated from dermatitis and septicaemia cases in Agamidae and Iguanidae families.
• The bacterium was identified as part of the oral microbiota in healthy bearded dragons but not in healthy Uromastyx.
• Experimental inoculation successfully induced dermatitis at scarified skin sites, with subsequent re-isolation of D. agamarum.

Conclusions:

• Devriesea agamarum is confirmed as a facultative pathogen capable of causing dermatitis in agamid lizards.
• Skin integrity breach is a critical factor for D. agamarum to cause disease.
• The study provides strong evidence for D. agamarum's pathogenic role in lizard dermatitis.