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The HSV-1 infection depends on the nuclear DNA replication, transcription machinery, and mitochondrial metabolism of the host cell.

A second group has succeeded in putting gene drives into HSV-1 that is growing in infected cells in lab dishes.

Deaths caused by HSV-1 - herpes simplex 1 - are almost unheard of in healthy people.

Scientists at the University of Cambridge said the HSV-1 strain of the herpes virus arose during vast migrations of people from Eurasia to Europe about 5,000 years ago.

In other words, an overwhelming infection caused by the HSV-1 virus.