That's too strong....are there likely more cases than those that have been confirmed? Absolutely, but if you ignore the data we have that means we are only guessing. Use the current data, and work very, VERY hard to quickly get better, more accurate data and amend recommendations as that data becomes available.
Using data from 2-3 months ago would have been more sufficient in not having to work nearly as hard to help this situation.
But we know how that went.