Testing may be inaccurate to up to 40% of cases. Not only because the tests are faulty (less likely), but because the virus is not present at the collection spo

Testing may be inaccurate to up to 40% of cases. Not only because the tests are faulty (less likely), but because the virus is not present at the collection spot all the time (more likely) especially if the virus has entered but not yet multiplied enough. It is highly likely based on how this spreads that every single passenger has it right now. Also, these ships may have a much higher death rate due simply because viral load may be much higher (another factor we are still guessing it). If the body gets a strong dose when the infection first happens, the anti-body building process may not be fast enough to fight it off. If the body gets a very small load, it is more likely to start combating the virus, perhaps at a rate slower than replication rate, but eventually it can kill off even a major infection as long as it entered slowly.