quellung reaction

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Related to quellung: quellung test

quel·lung re·ac·tion

2. if pneumococcal organisms, India ink, and specific antisera are mixed, the antibodies present in the sera will bind to the polysaccharide antigens of the pneumococcal capsule and the capsule will appear more opaque and swollen. This test will identify the organism as being pneumococcal as well as the specific capsular types. Synonym(s): capsular precipitation reaction
[Ger. Quellung, swelling]

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.

quel·lung re·ac·tion

(kvel'lung rē-ak'shŭn)
1. Synonym(s): Neufeld capsular swelling.
2. If pneumococcal organisms, India ink, and specific antisera are mixed, the antibodies present in the sera will bind to the polysaccharide antigens of the pneumococcal capsule and the capsule will appear more opaque and swollen.
[Ger. Quellung, swelling]

Neufeld,

Ferdinand, German bacteriologist, 1869-1945.
Neufeld capsular swelling - increase in opacity and visibility of the capsule of capsulated organisms exposed to specific agglutinating anticapsular antibodies. Synonym(s): Neufeld quellung reaction; Neufeld reaction; quellung phenomenon; quellung reaction; quellung test
Neufeld quelling reaction - Synonym(s): Neufeld capsular swelling
Neufeld reaction - Synonym(s): Neufeld capsular swelling
References in periodicals archive ?
Serotyping was performed by using the quellung reaction with antiserum for serogroup 6, factor 6b, and factor 6c (Statens Serum Institute, Copenhagen, Denmark).
In 51 of these, a pneumococcal serotype could be identified via the conventional Quellung reaction.
All isolates were serotyped by the Quellung reaction using antiserum (Statens Serum Institute, Copenhagen, Denmark).
Isolates were serotyped by the Quellung reaction (Alaska, northern Canada, Greenland, Norway, and northern Sweden), counter-immunoelectrophoresis (Finland), or coagglutination (Iceland).
All isolates with negative or doubtful reactions in CCIE were investigated by the classic Quellung technique, and K-type nontypeable isolates were investigated for the presence (K+) or absence (K-) of a visible capsule by wet mount microscopy with India ink.
Serotyping, performed by Quellung reaction, showed a 35F serotype.