Penicillin and its effect in producing a predominant gram-negative bacillary flora in upper respiratory tract of children.
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D002648:Child; D006090:Gram-Negative Bacteria; D006801:Humans; D009666:Nose; D010406:Penicillins; D014132:Trachea; D012122:Ventilators, Mechanical
D010406:Penicillins