PT - JOURNAL ARTICLE AU - Briody, B. A. AU - Cassel, William A. AU - Medill, Mary A. TI - Adaptation of Influenza Virus to Mice DP - 1955 Jan 01 TA - The Journal of Immunology PG - 41--45 VI - 74 IP - 1 4099 - http://www.jimmunol.org/content/74/1/41.short 4100 - http://www.jimmunol.org/content/74/1/41.full SO - J. Immunol.1955 Jan 01; 74 AB - The egg lines of the Seerey Type A prime and the SSM Type B strains of influenza virus are sensitive to the hemagglutinin (HA)-inhibiting and the in ovo neutralizing activity of the β inhibitor in normal ox serum. Adaptation of the Seerey and SSM strains to CF1, CFW, and NIH mice is accompanied by the development of resistance to the HA-inhibiting and neutralizing effect of β inhibitor. The sudden and concomitant nature of the appearance of extensive pulmonary consolidation in 4 days and the development of resistance to HA-inhibition and neutralization by β inhibitor suggests that these changes are interrelated. Virus resistant to β inhibitor has also been isolated by passage of sensitive virus in eggs in the presence of ox serum.