Table 2.

Comparison of hemagglutination activity in cell and egg produced influenza B virus infected A549 cells.

Virus production platform	Time P.I. (h)	B/Malaysia/2506/04
		cRBC	tRBC	gpRBC
Egg	4	0	0	0
	8	0	0	0
	12	0	0	0
	24	16	32	32
	48	64	128	128
	72	128	128	128
	96	128	128	256
MDCK	4	0	0	0
	8	0	0	0
	12	0	0	0
	24	16	32	64
	48	64	128	256
	72	128	128	256
	96	128	128	256

Abbreviations used: cRBC—chicken red blood cells; tRBC—turkey red blood cells; gpRBC—guinea pig red blood cells.