I wouldn't believe tweets put out by companies at the moment. Personally Im more inclined to believe my family member working on the frontline dealing with this very issue who himself has just come back from a 10 day period of isolation.
Social media is a great way of getting information to your customers and other media outlets very quickly but as in this case and indeed in the rail industry where I work, a common theme is the wrong information being "tweeted", mainly because the person who is operating the account at that time is only working with the information provided and not with the actual facts....