Camelidae and Cervidae Streptococcal Dermatitis Study Guide

Overview and Clinical Importance

Streptococcal dermatitis and related bacterial skin infections in camelids (llamas, alpacas) and cervids (deer, elk, reindeer) represent important integumentary conditions encountered in veterinary practice. While true streptococcal dermatitis is relatively uncommon as a primary diagnosis, Streptococcus species frequently act as secondary invaders in damaged skin. More commonly, bacterial skin diseases in these species include dermatophilosis (caused by Dermatophilus congolensis), staphylococcal folliculitis, and the systemic streptococcal syndrome known as alpaca fever (caused by Streptococcus equi subsp. zooepidemicus). Understanding the etiology, clinical presentation, and management of these conditions is essential for NAVLE success.

Etiology and Classification of Bacterial Skin Infections

Streptococcal Infections in Camelids

Streptococcus equi subsp. zooepidemicus is a Lancefield group C streptococci that causes both localized and systemic disease in camelids. This organism is considered a commensal in South American alpacas but is not a normal flora in North American populations, making these animals more susceptible to severe infection upon exposure.

Forms of Streptococcal Disease in Camelids

Dermatophilosis (Rain Rot)

Dermatophilosis, also known as rain rot, lumpy wool disease, or streptotrichosis, is caused by Dermatophilus congolensis, a gram-positive, actinomycete bacterium with a life cycle resembling fungi. Despite the name "streptotrichosis," this is NOT caused by Streptococcus species. The organism exists in two morphologic forms: motile flagellated zoospores (infective stage) and branching hyphae.