David Greenhalgh comments

This works both ways. We are supporting the eateries and bars where we can, but have noted the ones that have declined to close and they are now off our list of places to go.

The reason they haven't tested everyone aboard so far is that it wouldn't bring anything. The current tasing (as of 6 days ago) used PCR (polymerase chain reaction) based testing that takes several very careful hours to prepare for each sample and is known to be prone to false negatives if there is insufficient viral material in the sample. Pretty much every country is following advice by testing people only when they show signs of illness to be sure there are detectable quantities of pathogen. There are faster, more sensitive tests in design but making enough of them and distributing them will take more than a couple of days and you can be sure whichever big-pharma corp invents it will not be giving it out for free.