The origins and global spread of two recent, yet quite different, pandemic diseases is discussed and reviewed in depth: Candida auris, a eukaryotic fungal disease, and COVID-19 (SARS-CoV-2), a positive strand RNA viral respiratory disease. Both these diseases display highly distinctive patterns of sudden emergence and global spread, which are not easy to understand by conventional epidemiological analysis based on simple infection-driven human- to-human spread of an infectious disease (assumed to jump suddenly and thus genetically, from an animal reservoir). Both these enigmatic diseases make sense however under a Panspermia in-fall model and the evidence consistent with such a model is critically reviewed.
~However the great exemplar of the emergence of a new pandemic disease of considerable virulence and pathogenicity was the Spanish Flu Pandemic 1918–1919. That pandemic has been analyzed in great detail by Hoyle and Wickramasinghe (1979), and the astute and engaged reader of all that evidence is left with only one conclusion—the Spanish Flu disease came from Space on a massive scale, and killed tens of millions before the advent of air travel.
The italics are the authors' own
I'm not entirely sure I completely agree with that italicised phrase