Are there known thresholds for the exact number of bacteria/viruses that it takes to cause any given illness?

3272>Is it about the same for all diseases, or are some more "potent" than others?





I am disregarding how transmissible they are, in other words it's much easier to catch a cold than HIV, but does it take roughly the same number of "organisms" of each to infect the host?





Would just one individual HIV virus, if injected directly into the bloodstream, eventually replicate enough to cause AIDS?
Reply:It is called the infective dose.
Reply:there are so many other variables like the immunity of individual etc that the thresholds for disease causing microbes have not been established. a Small no of microbes under favorable conditions may cause illness and the same microbe may not be able to manifest even in larger nos under less favorable conditions.

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