Table 1.

The recovered virus titer from HmLu and BHK cells after several passages.

		Titer (PFU/ml) recovered from
Virus	Strain	HmLu (7P)a)		BHK (5P)a)
		Cell-free	Cell-associated	Cell-free	Cell-associated
	007Lm	3.4 × 103	6.3 × 104	6.0 × 105	1.2 × 106
	55L	2.5 × 105	2.2 × 106(7P)b)	1.6 × 105	2.4 × 105
	009L	1.0 × 105	9.2 × 105(7P)b)	3.0 × 105	4.0 × 105
Asia 2	M25CR	2.0 × 103	8.0 × 105	4.0 × 105	2.0 × 105
	011C	5.0 × 103	2.0 × 104	0.6 × 105	1.6 × 105
	50Con	6.0 ×103	3.0 × 104	2.5 × 105	0.5 × 105
	50Cb1	3.0 × 101	2.2 × 102	1.0 × 104	7.0 × 103 (3P)b)
	Ac96I	< 5	≤ 5	< 5	< 5
	Th12	< 5	< 5	1.0 × 104	8.0 × 103 (3P)b)
Asia 1	50Sc.	1.0 × 105	1.9 × 105(7P)b)	1.1 × 105	1.9 × 105
	81ND.	1.5 × 104	2.5 × 104(7P)b)	5.5 × 103	1.5 × 104 (3P)b)
	82Con	1.2 × 106	1.2 × 106(4P)b)	4.5 × 105	5.5 × 105(4P)b)
	83mLN	2.0 × 105	1.0 × 105(7P)b)	1.3 × 105	1.5 × 105

^a) Preset passage level.

^b) Cultures at these passages were unable to be transferred further.