Possible pathogens in rainwater harvesting tanks

Just came across this article entitled “Rainwater harvesting tanks enable spread of dangerous pathogens, study shows”.  The article describes a fairly straightforward set of findings from rainwater storage tanks in South Africa.  Researchers found Legionella, Klebsiella, Giardia, Salmonella, and Yersinia.  Not a friendly-sounding list of bugs. However, I have the usual set of issues with …