Dermatophilosis: Current Advances and Future Directions

Dermatophilosis, caused by the Gram-positive, filamentous bacterium Dermatophilus congolensis, is a significant skin disease affecting cattle health and productivity. This review provides a comprehensive overview of the molecular characteristics and resistome landscape of D. congolensis, highlighting recent advances in genomic research. We discuss the bacterium’s genomic architecture, including genome size, GC content, and gene composition, and its phylogenetic placement within the Actinomycetales. The roles of key virulence factors, such as proteolytic enzymes, hyphal invasion and zoospore motility, and the products of nasp and agac genes, were examined in relation to detection and pathogenesis. Additionally, the resistome profile is analyzed, focusing on identified antibiotic resistance genes, resistance mechanisms—including efflux pumps and beta-lactamases—and the contribution of mobile genetic elements to horizontal gene transfer. The implications of these molecular insights for diagnosis, treatment, and antibiotic stewardship in cattle production are critically evaluated. Finally, we outline future research priorities to enhance understanding of D. congolensis biology and improve disease control strategies. This review underscores the importance of integrated molecular and antimicrobial surveillance to safeguard cattle health and promote sustainable livestock management.