Mycoplasma agalactiae (M. agalactiae)

Mycoplasma agalactiae is a small, wall-less bacterium that serves as the primary causative agent of contagious agalactia in small ruminants, particularly sheep and goats (Source: Merck Veterinary Manual). It belongs to the class Mollicutes and is characterized by its lack of a peptidoglycan cell wall, which renders it intrinsically resistant to antibiotics that target cell wall synthesis, such as penicillins and cephalosporins (Source: NCBI StatPearls). The pathogen primarily affects the mammary glands, joints, and eyes, leading to clinical symptoms like mastitis, arthritis, and keratoconjunctivitis, which cause significant economic losses in the livestock industry (Source: Journal of Clinical Microbiology). Treatment strategies focus on the use of antibiotics that penetrate the cell and target internal molecular machinery, including tetracyclines, macrolides, and fluoroquinolones (Source: PubMed). Because Mycoplasma agalactiae is an entire organism rather than a single molecular target, drug development often focuses on specific conserved bacterial enzymes or ribosomal components essential for its survival (Source: Veterinary Research). It is considered an incorrect target in a molecular context because it represents a pathogen species rather than a specific protein or receptor.

Other names

Contagious agalactia agent

Antibiotics targeting this organism typically act by inhibiting bacterial protein synthesis through binding to the 30S or 50S ribosomal subunits, or by inhibiting DNA replication through the inhibition of DNA gyrase and topoisomerase IV.