TABLE 2.

Complement-mediated bactericidal titers of pooled mouse and guinea pig antisera against homologous and heterologous strains^a

Homologous strain	Bactericidal activity (1/titerb)				Heterologous strain	Bactericidal activity (1/titerb)
	Mouse		Guinea pig			Mouse	Guinea pig
	Sequential	Mix	Sequential	Mix		Sequential	Mix	Sequential	Mix
1000	128	6	64	16	BZ147	40	51	9	>128
8047	300	125	>128	>128	CU385	128	<4	12	4
BZ198	220	1000	40	16	H44/76	>128	21	64	8
BZ83	109	205	24	>128	MC58	8	<4	>128	<4
M986	101	133	128	>256	NG3/88	4	<4	9	5
NGP165	120	90	64	>256	NGH15	>128	<4	>128	92
NMB	441	141	>256	>256	NGH38	<4	<4	>128	<4
RM1090	>128	>128	>1024	>1024	S3032	400	230	32	<4
Z1092	>128	>128	>1024	>1024	S3446	<4	<4	24	4
					SWZ107	40	<4	<4	<4

^aFor definitions of homologous and heterologous strains, see Table 1 and the text.

^bThat is the dilution of serum that results in 50% killing of bacteria after 60 min of incubation in the presence of human complement.