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Simultaneous measurement of pneumococcal polysaccharide antibodies reported.

Vaccine Weekly

| November 12, 2003 | COPYRIGHT 2003 NewsRX. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan.  All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)Copyright

2003 NOV 12 - (NewsRx.com & NewsRx.net) -- Researchers have developed a method for simultaneous measurement of antibodies to 23 pneumococcal capsular polysaccharides.

According to published research from the United States, "We describe a fluorescent covalent microsphere immunoassay (FCMIA) method for the simultaneous (multiplexed) measurement of immunoglobulin G (IgG) antibodies to 23 pneumococcal capsular polysaccharide (PnPS) serotypes present in the pneumococcal polysaccharide vaccine (PPV23) licensed by the Food and Drug Administration, i.e., PnPSs 1, 2, 3, 4, 5, 6B, 7F, 8, 9N, 9V, 10A, 11A, 12F, 14, 15B, 17F, 18C, 19A, 19F, 20, 22F, 23F, and 33F."

"In addition, the assay incorporates an internal control that allows for contemporaneous evaluation of the effectiveness of pneumococcal cell wall polysaccharide (C-PS) preadsorption and a second control of PnPS 25 (which is not present in any polysaccharide or conjugate vaccine), which can be used to evaluate interassay reproducibility (useful for pre- versus postvaccination studies)," stated Raymond E. Biagini and collaborators at the Centers for Disease Control and Prevention. "The FCMIA was standardized with U.S. reference antipneumococcal serotype standard serum 89S-2."

"Preadsorption of 89S-2 with each PnPS and C-PS yielded homologous inhibition for serotypes 1, 6B, 9N, 9V, 11A, 12F, 14, 15B, 18C, 19A, 19F, 20, 22F, 25, and 33F; heterologous inhibition for serotypes 9V, 10A, 11A, 12F, 15B, 17F, 20, and 23F; and neither homologous nor ...

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