Are you worried about Ebola?

Sign on the front door of LifeLabs laboratory in Vancouver, BC

This sign has been up on the door of the LifeLabs location at City Square in Vancouver since September 3, 2014.

If I was to be pedantic I think that the sign should be worded, "If you have visited West Africa in the last 21 days." My most recent travel could have been from Heathrow airport to Vancouver, but before that I could have visited West Africa.

So, probably a good idea to be concerned about the spread of the disease, but the ambiguity of the sign does not help to improve the safety of the clinic workers.