Thermo Scientific™ Streptex™ Polyvalent Latex Agglutination Test kit

The Thermo Scientific™ Streptex™ Latex Agglutination Test is a rapid and reliable diagnostic assay designed to identify and differentiate streptococcal isolates based on Lancefield group-specific antigens. The test utilizes latex particles coated with group-specific antibodies, which agglutinate visibly in the presence of homologous streptococcal antigens, providing clear, interpretable results within minutes.

With more than 50 years of proven performance, the Streptex test delivers >99% sensitivity, offering laboratories a trustworthy and efficient workflow solution for streptococcal group identification. It is ideal for clinical microbiology laboratories needing rapid, cost-effective differentiation of beta-hemolytic streptococci directly from culture plates.

Key Features & Benefits

• Rapid Group Identification
  Detects streptococcal Lancefield Groups A, B, C, D, F, and G using enzyme extraction and latex agglutination.
• Simple Workflow
  Includes disposable mixing sticks, cards, and reagents for streamlined setup and interpretation.
• High Sensitivity and Specificity
  Validated performance with >99% sensitivity; eliminates need for control latex.
• Clear Visual Results
  Agglutination reactions appear as white clumps against a dark background.
• Flexible Application
  Works with isolates grown on selective or non-selective media; enzyme and acid extraction options available.
• Compact Kit Configuration
  Efficient packaging with color-coded reagents and clear workstation layout.

Product Configurations

Additional Option:

For rapid extraction, use Streptex™ Acid Extraction Kit (Ref: R30951301). Note: Acid extraction is not suitable for reliable Group D antigen detection.

Intended Use

The Streptex™ Latex Agglutination Test is a rapid, qualitative, manual enzyme immunoassay for identifying Lancefield streptococcal groups A, B, C, F, and G from cultured bacterial isolates. It is intended for in vitro diagnostic use by qualified laboratory professionals, aiding clinicians in selecting appropriate treatment options for streptococcal infections.

Not for use as a companion diagnostic. Not all configurations are available in all regions.

Test Components 

• Sensitized latex reagents (group-specific antibodies)
• Extraction enzyme
• Polyvalent positive control
• Disposable reaction cards
• Disposable mixing sticks
• Instructions for use

Specifications

Applications

• Clinical Microbiology Diagnostics
  Rapid identification of streptococcal groups from throat swabs, wound cultures, and other specimen types.
• Hospital & Public Health Laboratories
  Used in routine pathogen identification workflows for pharyngitis, neonatal infections, sepsis, and skin/soft tissue infections.
• Education & Training
  Ideal for laboratory science teaching institutions and diagnostic method training.

Streptococci are facultative anaerobic, catalase-negative, gram-positive cocci arranged in chains or pairs. Beta-hemolytic strains are further classified by their Lancefield group antigens, located in the bacterial cell wall. These groups are critical for diagnosis and treatment of illnesses such as:

• Pharyngitis
• Scarlet fever
• Otitis media
• Impetigo
• Neonatal sepsis
• Endocarditis
• Meningitis
• Necrotizing fasciitis

The Thermo Scientific™ Streptex™ Latex Agglutination Test offers an easy-to-use, cost-effective solution for rapid identification of clinically significant streptococcal groups. With robust performance, flexible kit options, and a proven track record, Streptex remains a reliable choice for microbiology labs aiming to improve accuracy and turnaround time in pathogen identification.