Latex Microbiology Tests

A comprehensive range of rapid latex agglutination tests for applications in clinical microbiology.

Streptococcal latex test

The majority of species of Streptococci possess group specific antigens which are generally carbohydrate structural components of the cell wall. Lancefield demonstrated that these antigens can be extracted in a soluble form and further identified by precipitation reactions with the homologous antisera.
Group specific Streptococcal antigens are extracted from the streptococci using a simple and rapid incubation procedure. Latex particles, coated with group specific antibodies, are then used to identify these antigens.

The Plasmatec Streptococcal test kit is a rapid latex system for the accurate determination of the six clinically significant groups of hemolytic Streptococci. Latex reagents are provided for the Lancefield Groups A,B,C,D,F and G. The kit also includes two bottles of freeze dried extraction enzyme, a positive control and disposable reaction cards sufficient for 300 tests.

STE/010Streptococcal latex test kit50 testMSDS

Staphylococcal latex test

The Plasmatec Staphylococcal latex test exploits the ability of S.aureus to produce coagulase and/or protein A. The mode of operation of the test is twofold. Firstly the coagulase will interact with fibrinogen coated onto the surface of the latex particles forming clots and resulting in the visible agglutination of the latex. Secondly, the protein A moieties of the microbial cell walls will bind to IgG coated onto latex particles resulting in a cross linked complex and again, visible latex agglutination. In the absence of either coagulase or protein A the latex remains in smooth suspension.

The Staphylococcal latex test kit is provided complete with latex test reagent, latex control reagent and disposable reaction cards.

STA/010Staphylococal latex test kit50 testMSDS
STA/012Staphylococal latex test kit100 testMSDS

E.coli latex test kit

The Plasmatec E. coli Latex test is a latex agglutination test for the rapid identification of E. coli serogroup O157. The test is best used in conjunction with Sorbitol MacConkey agar.

E. coli 0157 strains cannot ferment sorbitol and will therefore appear, if present, as colourless colonies. The majority of other E coli strains are capable of sorbitol fermentation and therefore grow as characteristic pink colonies. Sorbitol MacConkey agar can therefore be used as a primary screening method, with only non-sorbitol fermenting colonies tested with latex. Control latex is included to check for auto-agglutination.

ECO/012E. Coli 0157 latex test kit100 TestMSDS

Rotavirus latex test

Rota-Virus has been shown to be a principle causative agent of gastro-enteritis. Patients harbour up to 1010 virus particles per gram of faeces. During the winter months rota-viral disease may occur in epidemic proportions.

The Plasmatec Rotavirus latex test is based upon the principle of antibody sensitized latex particles agglutinating in the presence of the homologous antigen. The Rotavirus latex test kit comprises; latex test reagent, latex control reagent, positive/ negative controls and an extraction buffer.

ROV/012Rotavirus latex test kit100 TestMSDS