"the UK could already have up to 55,000 cases of the coronavirus."
http://www.telegraph.co.uk/global-health/science-and-disease/coronavirus-news-uk-us-travel-ban-deaths-cases-latest/
The tested positive figure is 1,950. So they now think there are up to 30 times as many actual cases as the number that have been tested positive.
That would make it a non-scary virus.