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. 2001 Jan;69(1):170–176. doi: 10.1128/IAI.69.1.170-176.2001

TABLE 2.

Virulence of ureolytic and nonureolytic strains of Y. pestis

Strain	Phenotype	LD₅₀ for mouse infected via:
Strain	Phenotype	s.c. route^a	i.v. route^a	i.g. route^b
6/69	Ure⁻	<10¹	<10¹	10^{6.7 ± 0.3}
6/69 U5.1	Ure⁺	<10¹	<10¹	10^{7.2 ± 0.2}
6/69 U2.1	Ure⁺	<10¹	<10¹	10^{7.5 ± 0.7}

^a

Results are mean values of two separate assays.

^b

Results are mean values ± standard deviations of three separate assays.