TABLE 3.

Comparison of polyclonal versus monoclonal antibodies for serogroup identification of serogroup Y and W135 meningococci

Rabbit antiseraa	No. of isolates	MAbb	Positive reaction ODs			Negative reaction ODs
			Mean	SD	Range	Mean	SD	Range
B	77	B	1.268	0.385	0.326-2.043	0.026	0.021	0-0.123
C	66	C	0.735	0.834	0.875-3.5	0.024	0.028	0-0.095
Y	29	Y	1.782	0.560	0.617-2.615	0.014	0.019	0-0.076
W135	6	W135	1.803	0.929	0.722-2.912	0.024	0.030	0-0.096
Nongroupable	1c	B	1.581	NAe	NA	0.057	NA	NA
Nongroupable	4c	C	2.250	0.826	1.236-3.113	0.040	0.024	0.003-0.088
Nongroupable	2d	Negative	NA	NA	NA	0.046	NA	0.014-0.076

^aIn-house-produced antisera and serogroup determined by bacterial agglutination method.

^bSerogroup determined by indirect whole-cell ELISA.

^cGrouping confirmed by PCR detection of serogroup-specific siaD genes.

^dIdentified by PCR detection of serogroup-specific siaD genes as C (one isolate) and Y (one isolate).

^eNA, not applicable.