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. 2014 May;20(5):762–771. doi: 10.3201/eid2005.130953

Table 3. Relative virulence of viridans group streptococci strains in a neutropenic mouse model*.

Strain Streptococcus mitis cluster Pitt bacteremia score of infected patient LD50
SVGS004 3 1 4.1 × 105
SVGS006 2 2 1.6 × 106
SVGS016 2 1 1.4 × 105
SVGS019 1 3 1.9 × 104
SVGS031 2 1 3.6 × 105

*SVGS, Shelburne viridans group streptococcus; LD50, considered, for the purpose of this study, to be the dose at which 50% of the animals nearly died.