Twigs! You might want to print out the article on the New England Journal of Medicine's site linked here...
http://content.nejm.org/cgi/content/full/348/20/e6 and take it to your co-workers, expressing concern. Please note the sentence in the second paragraph indicating that people can be "infective" even though they are not showing any symptoms yet, but are still incubating the illness.
Thank you SO much for this article. I have already printed it out and will give it to my boss. He's to go too and has expressed some concern. Maybe I can get him to reconsider.