“…Polyoma virus multiplies in mouse embryo cells and mouse tumours. Despite its well-known oncogenic transforming properties it probably does not constitute a risk to humans, as it has not been shown to transform any human cell lines, nor have any antibodies against the virus been found in humans (Stoker, 1963). However, polyoma virus has been propagated in monkey kidney cells (Stewart et al, 1957) and a hamster strain has been reported to grow in human amnion cells (Dmochowski, 1959).…”