You searched for: “plagues
To greatly annoy, to worry, to afflict, or to greatly torment someone. (1)
(New plagues, survival, and the various mutual adaptations carried on with our microbial fellow travelers)
(New diseases are always coming into existence, most change with time, and some even vanish from known existence!)
(Until recently, the usual explanation for the first pandemics was not biological but a result of immorality)