Well, the test sample on the cruise ship wasn't random - it was initially people with symptoms and then close contacts of people who had already been diagnosed. So you'd expect it to be quite high as people are highly likely to pass a virus on to someone they are sharing a cabin with.
I'm as reasonably concerned as anyone, as a hypochondriac of many years, but it amazes me how many people on this thread seem to just revel in the panicking rather than reading the most reliable reports.
Look at the WHO daily status reports for a breakdown of who has caught the virus locally and who in China. Apart from in Singapore and on the cruise ship, there are currently very limited onward transmission chains outside China.
The Brighton guy caught it from someone from China at the conference in Singapore, not randomly in the street. The conference was before the Wuhan/Hubei travel ban was instituted. Several other people took infections back to their countries including a Malaysian and a South Korean. All this information is readily available.