Andes virus is simply not that contagious and infection comes nearly entirely from those who are symptomatic.I built a probabilistic model decomposing this question into exposure pools — the widow’s KLM boarding, the Airlink flight from St Helena, the JNB hospital, household contacts of disembarked passengers — applying Andes-specific transmission and incubation parameters, then conditioning on the observation that zero non-passenger cases have surfaced as of today. Running this, I get a 4% chance that there will be more than 5 cases from people outside those on the Hondius cruise, with a 70% chance of at least one non-passenger case by August, and about a 17% chance of three or more.
Peter Wildeford's analysis on hantavirus - and why we don't need to worry about a COVID style pandemic.