The production and effect of interferon on influenza virus growth in chick embryo lung epithelial and fibroblast cell cultures

Cultures of fibroblastic cells prepared from chick embryo lung infected with low multiplicities of influenza type A virus strains were found to produce more interferon than did cultures of epithelial cells prepared from the same organ. Fibroblastic cell cultures were also found to be more sensitive to the action of interferon than were epithelial cells with respect to the levels of infectious virus produced and the duration of interferon action. Cultures of the two cell types treated with interferon did not differ with respect to the number of cells involved in virus synthesis.

5-Azacytidine as a mutagen for arboviruses

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The nucleic acid of African horse sickness virus

The effect of actinomycin D on the growth of African horse sickness virus in monkey kidney cells was studied. It was found that actinomycin D inhibited the yield of virus. It is suggested that African horse sickness virus is either a DNA containing virus or an RNA virus whose replication is DNA-dependent.

Sensitivity of bluetongue virus to lipid solvents, trypsin and pH changes and its serological relationship to arboviruses

Bluetongue virus was found to be resistant to ether, chloroform and sodium deoxycholate under a variety of conditions but sensitive to treatment with trypsin. The virus had a narrow zone of pH stability between pH 6 and 8 in Michaelis buffer. Below pH 6 bluetongue was irreversibly inactivated within 1 min. at 37° C. In many of its characteristics, bluetongue virus appears to be closely related to the reoviruses.