Table 3.

Aerosol inoculation of Legionella strains

StrainDose (total CFU)No. of guinea pigs killed/no. testedCommentsRetained dose
L. pneumophila serogroup 1 (Philadelphia)1 × 109 2/3Death within 5 days∼2 × 105
L. longbeachae serogroup 1 ATCC 334621 × 109 0/3No symptoms2 × 105
L. longbeachae serogroup 2 ATCC 334841 × 109 0/3No symptoms∼2 × 105
L. longbeachae serogroup 1 A5H51 × 109 3/5Death within 5 days (days 2 and 4)3.5 × 105
B81 × 109 0/5No symptoms1 × 105
B81 × 1010 0/5Slight symptoms in most animals1.6 × 106