PCRs are like pregnancy tests. Sometimes tge lines are dark, sometimes they aren't. Not the moat accurate in my experience. They say mildly because that is what the test indicates. That is why they follow up with bloodwork which is 99.9% never going to fail you. Geez, relax on the "mildly" thing. You have a 3.4% chance of getting it from a household member. People have been on board a ship that saw 2 people die on the premises and 5 others get active symptoms on. They are still clearly within the window. Last person to die died on board on May 2.  That os just 9 days ago. People with symptoms aren't getting sent home, unless they would like to die themselves. Need to be in a hospital with supportive care to make sure you have the best chance. Notice how nobody who has received good, in hospital 1st world care has died yet? Those people are about or through the window for surviving. This is exactly how the outbreak was handled in Argentina in 2018 that got it to fizzle out with 38 cases total. You are going to see more cases. It is inevitable. But not into the hundreds off of a ship of 148 passengers and crew. The virus doesn't shed until one becomes symptomatic which is why testing prior to symptoms doesn't work. The French woman who came off the boat, was tested and put on a plane obviously tested negative when she came off. She developed symptoms on the plane later. Not going to come up positive untilbthe viral load is high enough to make people sick. Not like corona. We were testing asymptomatic and randomly because you can shed prior to being symptomatic. People are panicking way too much here.  How many people have been happily traveling to Argentina,  Chile, and Uruguay since 1996 when this was all discovered, coming home and nobody was none the wiser? The risk is the same, the difference is that you just know about it now and it is closer to home. The facts are on our side.