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In this laboratory (Group4 et al., 1952, 1953) a microbial product was found which exerted, in vivo, a definite but transient effect on the development of pneumonia following infection with influenza A virus and which suppressed effectively the nontransmissible pneumonia in mice induced by the intranasal instillation of large inocula of Newcastle disease virus (NDV) described by Ginsberg (1951) and by Davenport (1952). Curiously, this preparation failed (a) to inactivate these viruses in vitro, (b) to affect viral synthesis in mouse lung tissue or in the allantoic cavity of eggs, or (c) to neutralize in vitro the toxicity of Newcastle disease virus for mouse lung tissue. Thus, it appeared that this substance selectively inhibited the development of the lesion. The absence of demonstrable antimicrobial or antiviral activity of this microbial product precludes its designation as an antibiotic according to the classical definition (Waksman, 1948). This preparation, provisionally designated APM (acid precipitable material), has here been named "xerosin". Some of the properties of xerosin, its modifying effect on certain viral lesions, and a description of Achromobacter xerosis, n. sp., which produces xerosin are presented in this paper.

journal of bacteriology

SUPPRESSION OF CERTAIN VIRAL LESIONS BY A MICROBIAL PRODUCT, XEROSIN, LACKING IN DEMONSTRABLE ANTIVIRAL PROPERTIES AND PRODUCED BY ACHROMOBACTER XEROSIS, N. SP