[Dog Gone]

Apparently, a spore or two won't do it. Something like 12,000 are required.

[RGVTx]

I saw an expert on Fox News yesterday say how many spores it takes for inhalation of anthrax to cause illness. It was a large amount, but the number escapes me now. He followed by saying that amount would fit on the head of a pin. So it a large amount of spores, but would be almost undetectable by eyesight.

[John Jamieson]

This counting spores thing has gotten totally ridiculous. 3 micron spores fit 70,000,000 per square inch, one layer thick. It's no comfort that it takes exactly 11,734 spores to infect you. That's about the number that would fit on the head of a pin.