Table 1.

Comparison of hemagglutination activity in cell and egg produced influenza B virus infected MDCK cells.

Virus production platform	Time P.I. (h)	cRBC			tRBC			gpRBC
		A/N	A/W	B/M	A/N	A/W	B/M	A/N	A/W	B/M
Egg	4	0	0	0	0	0	0	0	0	0
	8	0	0	0	0	0	0	0	0	0
	12	0	0	0	0	0	0	0	0	0
	24	256	16	32	128	64	32	32	32	64
	48	512	128	64	256	256	128	128	256	128
	72	512	128	128	256	256	512	256	256	512
	96	512	128	128	256	512	512	128	256	256
MDCK	4	0	0	0	0	0	0	0	0	0
	8	0	0	0	0	0	0	0	0	0
	12	0	0	0	0	0	0	0	0	0
	24	256	32	8	128	64	4	32	64	64
	48	1024	128	64	512	1024	64	256	512	256
	72	512	128	128	512	1024	64	512	512	512
	96	512	128	64	256	512	64	128	512	256

Abbreviations used: cRBC—chicken red blood cells; tRBC—turkey red blood cells; gpRBC—guinea pig red blood cells; A/N—A/New Caledonia/20/99; A/W—A/Wisconsin/67/05; B/M—B/Malaysia/2506/04.