Decimate means you kill 1 out of every 10. It's probable that we decimated the virus and more. It's just that doesn't really make a difference.
Decimate means leaving 1 out of 10 alive. A 90% reduction.
> Decimation was a form of Roman military discipline in which every tenth man in a group was executed by members of his cohort. ... The word decimation is derived from Latin meaning "removal of a tenth".