Eh? Of course it's airborne. How else do these church choirs who all die a few weeks after getting together catch it? They're not all going to touch the same surfaces. They are all going to breathe the same air.

Once things have settled down there'll be lots of talk about 'bringing manufacturing home' and then they'll realise it costs too much so they'll stockpile. Then they'll realise maintaining the stockpile costs too much so they'll deplete it. Then the cycle will begin again.