Institute of Tropical Medicine, Nagasaki University
Abstract
Karyotype pattern of the cells persistently infected with small plaque variant viruses isolated from ECHO virus type 11 (gregory strain) was studied after several passages of subculture. The results are as follows. 1. The mode of chromosome number in infected HeLa cells was 67 (28%) with the range from 62 to 69, while those in uninfected cells (control) was 68 with the range from 66 to 68. 2. The karyotype analysis of infected cells revealed a decrease in groups B, C and D, and an increase in group A, F and G. 3. Such chromosome aberrations as double minutes and dicentries were observed in infected cells