Chemical/Bio weapons used on Conus?

[TiggerCCW UK]

As I've mentioned previously, in my game there are zombies. I've had the zombies created by the radioactive mutation of chem/bio weapons. Obviously in Europe there were both Chem and Bio agents in use, but I'm not sure about Conus. I know it was nuked, but were Chem and Bio weapons used on Conus in the V1 timeline? Its just so I can start figuring out how widespread the zombies would be there. If they haven't been created there I'll have some having been brought back from europe, either deliberately for study - we've all seen how well that works in films, or by accident on a boat that becomes overrun with zed's and beaches, allowing them to escape and spread the plague.