"It's unusual for respiratory diseases transmissible even before the first symptoms have occurred," he told Al Jazeera.- quoted from How does coronavirus spread and how can you protect yourself? @ February 20, 2020
"But the consequences is that if it happens then they have no public health means to sort out or to identify people at risk of transmitting, because they don't even know that they're ill yet."
Anyway, I'm fine--for now, I guess.
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