The math of a 61 RO and two week incubation with shedding during incubation:
patient 0 day 0 sick none
Patient 61 day 14 sick 1
Patient 3721 day 28 sick 61
Patient 226,981 day 42 sick 3,721
Patient 13,845,841 day 56 sick 226,981
That is why an RO of 60 as shown on the ship off japan is so completely hard to believe but fits very well with the Chinese response to this virus.
If the RO is 61 as the data so far from the japan cruise shows then it 4 times the worst plagues we have ever known in history.