I heard this, too, and I wonder if any companies will extend this travel ban to local transit. I work in Seattle, and I ride a ferry and a bus to get to the office. The Seattle ferry, especially at rush hour is a crowded and not-incredibly-santiary experience, as are the city busses. How long before MSFT/GOOG/AMZN/etc. are asking people not to ride the ferries? Or busses?