Phenotypic variability of X-protein expression by mastitis-causing Streptococcus agalactiae of serotype NT/X and opsonic activities of specific antibodies.

Abstract excerpt

This study examined the role of antibodies against the X-protein, a surface-localized antigen frequently associated with streptococci causing mastitis in cattle, in the opsonization and phagocytosis of unencapsulated Streptococcus agalactiae. The analysis of various strains of serotype NT/X by flow cytometry, after labeling with a monoclonal antibody to X-protein, revealed that they consisted of a mixture of...

Topics

• Animals
• Antibodies, Bacterial
• Antigenic Variation
• Antigens, Bacterial
• Bacterial Outer Membrane Proteins
• Cattle
• Complement System Proteins
• Female
• Flow Cytometry
• Gene Expression Regulation, Bacterial