Hantavirus kills nearly 4 in 10 people who catch it. Six just got it on a cruise ship. Moderna's stock jumped 19% in five days. The math reveals what investors are actually buying. Hantavirus pulmonary syndrome has produced 890 cases in the US between 1993 and 2023. Three decades, less than nine hundred Americans. Mortality runs near 38%. There is no FDA-approved vaccine. There has never been one, because the traditional vaccine math does not work. A new vaccine takes $1-2 billion and a…