Chromosome after smallpox vaccination

Chromosome aberrations and sister-chromatid exchanges (SCEs) in peripheral blood lymphocytes of patients suffering from poliomyelitis

The frequencies of sister-chromatid exchanges (SCEs) and various chromosome aberrations were studied in blood lymphocyte cultures of individuals suffering from polio virus infection. The frequency of SCEs was found to be within the normal range in polio patients whereas the frequency of chromatid breaks, gaps and other chromosome aberrations showed a significant (p less than 0.001) increase when compared with that of controls. It indicates that the mechanism(s) responsible for polio virus-induced chromosomal damage may not be related to or affect the molecular process(es) that functions in SCE formation.

Chromosomal aberrations and SCE in lymphocytes of children revaccinated against smallpox

Chromosomal changes were analysed in the peripheral lymphocytes of 14 twelve-year-old children before and 3 months and 10 months after smallpox revaccination (group A), and in peripheral lymphocytes of 8 children of the same age before and 1.5 and 8 months after revaccination (group B). A significantly increased number of aberrant cells was found after 1.5 and 3 months. In the blood samples collected 8 and 10 months after revaccination there was a decrease in the number of aberrant cells which, however, did not reach the control level. Sister chromatid exchanges (SCE) were counted in 5 children 1.5 and 8 months after revaccination, and their numbers did not differ from controls.