Process and materials for the rapid detection of
View Patent ↗Disclosed is a cell wall C-polysaccharide antigen of Streptococcus pneumoniae which contains not more than 10% by weight of protein, and preferably less which has been purified with 0.1N Na OH prior to deproteinizing. Also disclosed are polyvalent antibodies raised against Streptococcus pneumoniae which have been affinity purified by passing them over a chromatographic affinity matrix to which is coupled the purified and at least partially deproteinized antigen to render them antigen-specific.
1. A device for determining the presence of Streptococcus pneumoniae in a liquid sample, the device comprising:
a porous test strip comprising a sample receiving zone;
multiple binding agents, each binding agent comprising:
antigen specific polyclonal antibodies conjugated to a detectable particle, which specifically bind to a cell wall C-polysaccharide antigen of Streptococcus pneumoniae preparation,
multiple capture agents and
a capture zone;
wherein the porous test strip defines a liquid flow path extending downstream from the sample receiving zone and along which liquid received by the sample receiving zone can pass at least to the capture zone, the binding agents are disposed in a dried state along the flow path of the test strip downstream from the sample receiving zone and upstream from the capture zone, the binding agents are mobilizable by liquid passing along the flow path, and the capture agents are disposed in the capture zone and are each capable, in the presence of Streptococcus pneumoniae in a liquid sample received by the sample receiving zone, of binding a complex comprising one of the binding agents bound to the antigen.
2. The device of claim 1 , wherein the capture agents are antibodies.
3. The device of claim 2 , wherein the capture agents are polyclonal antibodies.
4. The device of claim 1 , wherein the detectable particle is a color-producing particle.
5. The device of claim 4 , wherein the detectable particle is colloidal gold.
6. The device of claim 1 , wherein the detectable particle is a color-producing particle and the capture agents are antibodies.
7. The device of claim 1 , wherein the presence of Streptococcus pneumonia in a liquid sample is determined within fifteen minutes of applying the liquid sample to the device.
8. The device of claim 1 , wherein the antigen specific polyclonal antibodies specifically bind to a cell wall C-polysaccharide antigen indigenous to all serotypes of Streptococcus pneumoniae.
9. The device of claim 1 , wherein the liquid sample is urine, serum, sputum or cerebrospinal fluid.
10. The device of claim 1 , wherein the antigen specific polyclonal antibodies are affinity-purified.
11. The device of claim 10 , wherein the antigen-specific polyclonal antibodies are affinity-purified with isolated and purified C-polysaccharide antigen of Streptococcus pneumoniae.
12. The device of claim 1 , wherein the antigen-specific polyclonal antibodies specifically bind to a preparation of S. pneumoniae cell wall C-polysaccharide antigen that has not more than about 10% by weight of protein.