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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. The extracted antigen in conjunction with latex agglutination offers a rapid, sensitive and specific method for identification of streptococcal
groups A, B, C, D, F and G from primary culture plates. If the antigen is present, it will react with the antibodies causing the latex beads to clump.
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