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Streptococcus agalactiae, latex agglutination.
In a latex agglutination test, a sample is mixed with latex beads coated with antibodies.
Majority of pathogenic streptococci possess specific carbohydrate antigens, which permit the classification of streptococci into groups. These streptococcal group antigens can be extracted from the cells and their presence demonstrated with latex particles previously coated with group-specific antibodies. If the antigen is present, it will react with the antibodies causing the latex beads to clump.
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