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CWPS Antiserum

All pneumococci have a cell wall polysaccharide (CWPS) which is species specific and, as the name suggests, is found on the cell wall. CWPS consists of phosphorylcholine. CWPS may sometimes be concealed beneath the capsule around the pneumococcus.

Product description

CWPS antiserum is produced by immunising rabbits with a pneumococcal strain without a capsule. The product is supplied in a vial with 1 mL ready-to-use antiserum, sufficient for approx. 300 tests.

Many years of experience producing Pneumococcus antisera

High quality

All absorbed free of cross-reactions

We offer experienced technical support

How to use

Equal quantities of antiserum and bacterial culture are mixed on a slide. Under a phase contrast microscope or on a slide, a positive reaction is indicated by agglutination. If the CWPS is concealed beneath the capsule around the pneumococcus, no reaction is seen.

Product range

Product Number
of tests
3653Anti CWPS (Cell Wall Polysaccharide) 300 1 mL vial 


Click the question to get your answer

Antibodies can be frozen, but the process of freezing and thawing is damaging for the antibodies, and the titer will drop (even though not dramatically) due to decomposition.
We have not made further studies on this, and cannot guarantee the stability of the sera, but we have experienced that mostly the titer stays at the same level if a serum is only frozen and thawn once.

Yes, it is possible, if you place an order in advance with the expected total volume for the period. In return we guarantee to keep the reserved lot for you.

Please send an inquiry. We might have it. Depending on the needed volume, we might be able to develop the requested product. It can be anything from a new pool composition to a new serum.


Please find the available downloads here.


Click on the link below to download the IFU.

Pneumococcus antisera


Please, reach out if you have questions, comments or requests.