infection of guinea-pigs by intranasal ( i.n . ) instillation of 10 ( 9 ) viable organisms of two newly isolated strains of legionella pneumophila ( 74/81 , serogroup 1 ; 166/81 , serogroup 3 ) did not induce disease , but 10 ( 4 ) organisms administered as a small particle aerosol ( less than 5 microns diameter ) produced a fatal widespread broncho-pneumonia within 3 days .
C0009450
infection
C0012634
disease