quellung reaction

(redirected from capsular precipitation reaction)
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quellung reaction

[′kwel·əŋ rē‚ak·shən]
(microbiology)
Swelling of the capsule of a bacterial cell, caused by contact with serum containing antibodies capable of reacting with polysaccharide material in the capsule; applicable to Pneumococcus, Klebsiella, and Hemophilus.