Keep in mind thats a singular attack described in Bears Den - there is no sign of any mass attack using bio weapons on large scale areas - i.e. he is using it as a terror weapon on a single target that is pretty much isolated - much different than hitting England with anthrax or using a bio weapon on China's major population centers
It also depends where its used - a healthy population that suddenly starts dying from a bio attack is going to be pretty damn obvious - i.e. its one thing to have typhus spread in an area where order has broken down and people are dying from starvation - its another to have a functioning city suddenly start to have a mass typhus event - so hiding what you did depends on the scale of it
i.e. suddenly having huge areas of Australia and NZ having die offs from disease out of nowhere when the populations were still healthy is a mass bio attack - and those didnt happen in the canon - not before April 2001 when the canon basically stopped - and the V2.2 canon covered Australia and New Zealand - there was no mention of mass bio attacks
keep in mind the canon as written didnt specifically mention nuclear attacks in Africa - but it did mention that both sides nuked oil production facilities in lots of countries as well as some harbors that could support the war effort - thus when I did the East Africa Sourcebook I brought those attacks to life as to their African targets - i.e. that change was plausible as it supported the existing canon nuclear attacks on oil production facilities and also on harbors that could support the war effort
but if its just for a campaign that you are running feel free to do what you like - i.e. for individual campaigns people make mods all the time - heck my GM used Last Submarine to nuke the Ploesti oil fields - and that is definitely not to canon
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