%0 Journal Article %A Stott, E. J. %A Heath, G. F. %T Factors Affecting the Growth of Rhinovirus 2 in Suspension Cultures of L132 Cells %D 1970 %J Journal of General Virology, %V 6 %N 1 %P 15-24 %@ 1465-2099 %R https://doi.org/10.1099/0022-1317-6-1-15 %I Microbiology Society, %X SUMMARY A system is described in which rhinovirus 2 may be grown in suspension cultures of L 132 cells. The virus adsorbed to the cells more efficiently at 33° than at 4°, probably by means of specific trypsin-sensitive lipoprotein receptors on the cells. Virus penetration demonstrated using a potent virus antiserum was temperature-sensitive and rapid at 33°. During single-cycle virus growth at 33° the latent period was about 4 hr and maximum virus yields were obtained about 10 hr after infection. Addition of 30 mm-MgCl2 in the medium enhanced virus release from the cells but did not affect the total virus yield. Highest virus yields were obtained at pH 7·7 and a temperature of 33°. Lower temperatures increased the latent period. At higher temperatures up to 37° the latent period was shorter and the virus titre ceased to increase earlier. At 39°the latent period was longer than at 33° and there was a severe inhibition of virus production. Shift-up and shift-down experiments indicated that the temperature-sensitive event or events at 39° occurred late in the growth cycle. %U https://www.microbiologyresearch.org/content/journal/jgv/10.1099/0022-1317-6-1-15