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Omni antiserum

Pneumococci are enclosed within a capsule consisting of repeated units of polysaccharides. The composition of the polysaccharides defines the serotype. 91 pneumococcal serotypes have been described to date, with more on the way. When omni antiserum is used as the method for identifying pneumococci, it should be noted that alpha-haemolytic streptococci can cross-react.

Product description

Omni antiserum is produced by mixing and washing polyclonal antibodies against the 91 serotypes. 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

Omni antiserum is used in the capsular reaction, also called the Neufeld test. Equal quantities of antiserum and bacterial culture are mixed on a slide. Under a phase control microscope, a positive reaction is indicated when the capsule enclosing the pneumococcus swells and becomes visible. The bacteria will frequently also agglutinate.

Product range

Product Number
of tests
2438Omni (all 92 serotypes)3001 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 only is 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.