Abstract
SUMMARY Thirty-seven different strains of acid fast bacilli, E. coli and staph. aureus were used as test organisms against streptomycin, PAS, neomycin and 4-Acetylaminobenzaldehyde thiosemicarbazone. Human type tubercle bacilli were inhibited by all of the above agents, virulent bovine bacilli by all but PAS, avian bacilli were resistant to all but streptomycin, while BCG and the saprophytic strains were susceptible to streptomycin and neomycin but unaffected by PAS or 4-Acetylaminobenzaldehyde thiosemicarbazone. These characteristic reaction patterns are useful in the identification and classification of strains of acid fast bacilli.
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