How is this for contagious? 12 of the 30 firefighters exposed now have flu-like symptoms

[link to komonews.com (secure)]

They didn’t exactly spend a lifetime exposed, either. If true that’s basically an R0 of 4, isn’t it? And more might still show symptoms. 19 of the 30 responded directly to the call, so if you count that way it might be even higher?