Molecular virologist David Speicher, the lead author of the study that found SV40 enhancers in COVID-19 vaccines, told The Epoch Times in a recent interview that much more research is needed to investigate DNA contamination in the COVID-19 vaccines. Unanswered questions include whether the SV40 sequence in the vaccines is triggering «turbo cancers,» meaning ones of a particularly aggressive and fast-growing variety, he said.