TABLE 1.

TCID₅₀s of wild-type and various mutated viruses, determined by infection of MT-2 cells

Virus	TCID50/mla
BH10-LD3-MP2-MNC	1.6 × 102 ± 1.8 × 10
BH10-LD3-MA1-MP2-MNC	4.0 × 102 ± 2.1 × 10
BH10-LD3-CA1-MP2-MNC	4.5 × 102 ± 2.3 × 10
BH10-LD3-MA1-CA1-MP2-MNC	1.0 × 103 ± 3.2 × 10
BH10-LD3-MA2-MP2-MNC	6.4 × 102 ± 2.4 × 10
BH10-LD4-MP2-MNC	4.3 × 102 ± 2.0 × 10
BH10-LD4-MA2-MP2-MNC	2.6 × 103 ± 4.1 × 10
BH10-LD4-MA1-MP2-MNC	1.5 × 103 ± 3.7 × 10
BH10	4.1 × 103 ± 6.2 × 10
BH10-LD3b	<10
BH10-LD4b	<10

^aDetermination of TCID₅₀s was as described previously (16). Results shown are the averages of three independent experiments. 

^bExamined as negative controls and very poorly infectious in these assays.