quel·lung reaction (kw l  ng, kvl ng)n. |
quellung reaction
[kwel′ung]
Etymology: Ger, Quellung, swelling; L, re, again, agere, to act
the swelling of the capsule of a bacterium, seen in the laboratory when the organism is exposed to specific antisera. This phenomenon is used to identify the genera, species, or subspecies of the bacteria causing a disease, including Haemophilus influenzae, Neisseria meningitidis, and many kinds of streptococci.
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