Which serological test is used as a confirmatory test for streptococci?

The serological confirmation of streptococci can indeed involve multiple methods, and each of the options listed plays a role in the identification and confirmation of different streptococcal species.

The Phadebact test is a type of agglutination test that detects specific antigens associated with bacterial strains. It can be used for rapid identification of bacteria from culture or specimens, making it a useful tool for confirming streptococcal infections.

The fluorescent antibody test utilizes antibodies labeled with a fluorescent dye to detect specific antigens in the sample. This method can enhance the sensitivity and specificity of detecting streptococci, making it effective for confirmation.

The Lancefield precipitin test categorizes beta-hemolytic streptococci based on specific carbohydrate antigens found in their cell walls. This test is critical for differentiating between various groups of streptococci and can provide a definitive identification of the strain.

Given that all the aforementioned tests can serve in the identification and confirmation of streptococci, indicating that more than one method may be employed underscores the diversity of approaches in serological testing. These tests can be utilized in different contexts depending on the clinical setting, the type of specimen, and the specific characteristics of the bacteria