The most impressive thing to me about how werewolves are used in fiction, is their ability to transform humans into other werewolves with their bites. Aside from the full moon myth, could it be potentially possible for an organism to 'infect' another organism and 'override' or 'corrupt' their physiology and essentially turn it into another? Are there instances of this happening in any way?
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Are we talking giving the victim the ability to shapeshift or merely turning the victim into something like the attacker? For the latter fictional zombies also do it, but it's a simpler process than werewolves, so it might be easier to explain. – VLAZ Mar 12 '19 at 18:20
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Turning the victim into something like the attacker is what I'm asking. It could be some foreign entity that bites an organism and the victim is turned into that entity. – malikc6 Mar 12 '19 at 18:23
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2"could it be potentially possible for an organism to 'infect' another organism and 'override' or 'corrupt' their physiology" : Yes ~ it's called a virus :) the physical transformation bit though? well that's a bit more tricky. – Pelinore Mar 12 '19 at 18:25
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1Closely related: https://worldbuilding.stackexchange.com/q/26001/32016 – F1Krazy Mar 12 '19 at 18:27
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I'm aware that viruses possess that but I meant like a complex organism. Like an unknown bird that pecks another bird species and turns that bird into a 'werebird'. I may be being a bit too vague with my wording but could this happen with a much larger more complex entity? – malikc6 Mar 12 '19 at 18:29
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Basically anything is possible. I assume we are talking about large mammals because anyone on earth knows about those ants at this point. The question should be, after defining that last portion, does it make sense for an organism to work like that - which leads us to the next question, why are there no werewolfs in reality? – Raditz_35 Mar 12 '19 at 18:30
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I could imagine some sort of Metamorphosis somehow being locked into a viral delivery system ~ but it's a bit hard to imagine how the quick change back & forth of a werewolf might be achieved in the real world ~ you'd have to design an organism with sliding bones & teeth etc that retract, slide out & lock with attached muscles to achieve that so it had two forms it could swiftly swap between ~ then lock that in as the metamorphosed form the virus carries. – Pelinore Mar 12 '19 at 18:34
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^ But how you'd achieve the hair growth & loss in a mater of minutes I haven't a clue. – Pelinore Mar 12 '19 at 18:39
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Oh and since this is more of an open discussion type of question right now, could you perhaps introduce us to your world, your aims, your desired outcome, your own thoughts? It could help getting answers you can use and not just philosophizing. Right now, it can't be answered definately – Raditz_35 Mar 12 '19 at 18:41
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To the best of my knowledge, there is no organism that can biologically rewrite anything's genetic code. – JBH Mar 12 '19 at 21:58
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@JBH : Think again, in many ways that's exactly what a virus does which (of course) is why we use them as a delivery system for gene therapy, & what does gene therapy do? [drum roll] it rewrites genetic code. – Pelinore Mar 12 '19 at 23:59
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Do hypothetical grey goo nanomachines count? – nick012000 Mar 13 '19 at 02:56
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1Could you be more specific in your question? I.e. how fast would this change have to occur, how fast would the infection have to work, What kind of organism would suffice (Amoebas,Tardigrades, Insects, Plants ..; Or is it about size?); As it currently stands, your question is much too broad. – bukwyrm Mar 13 '19 at 07:55
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"Turning the victim into something like the attacker is what I'm asking. It could be some foreign entity that bites an organism and the victim is turned into that entity" : then kindly edit that info into the question ~ also please edit the question to address the queries of @bukwyrm ^ ~ while you're at it can you please clarify (IN the question & NOT just comments) if it's a one off change or an ability to switch back & forth this question is about ~ "I may be being a bit too vague" yes, you're much too vague. – Pelinore Mar 13 '19 at 21:18
2 Answers
If you take a look at Rabies, you can already see a lot of parallels between the symptoms of it and vampire / werewolf mythology. There's an argument that this is the historical basis of some of the mythology in any event.
The problem with Rabies as the vector for transformation in this scenario is also its strength; it attacks the brain, causing massive changes in personality that are actually designed to spread the virus. While that's good for what you're proposing, it's also bad because it eventually kills the host.
But, for the sake of argument...
Imagine a modified rabies virus that still has the neurological damage but has a timer set on it; it only does neural damage for a specific period of time then stops, or lets the body's natural immune system overwhelm it, but only in the brain. In that scenario, you have a human or other animal changed (although not into a different species, just something barely recogniseable as human anymore) but is still capable of survival, albeit with the drive to bite and spread the virus according to the original programming.
This modified rabies virus, particularly if it starts introducing physical changes to a person after it abandons the brain, would give you all the appearance of a werewolf style disease, spread by bite, without genetic transformation.

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Some living things have evolved ways to co-op other creatures and force them into doing their bidding. There are species of wasps that lays eggs into other creatures like spiders and caterpillars. These eggs hatch into larvae which not only eat their host from the inside out, but also infect the hosts brain and manipulate it. There is a fungus who spores can infect ants. Once infected, these ants are consumed by the fungus, and then are manipulated into relocating to a suitable spot for the fungus to leave the ant and continue growing. Parasites called hairworms can infect crickets. Once the hairworms infect the crickets they release chemicals that cause said crickets to move toward sources of light. This is done because hairworms need water to reproduce, and water reflects moonlight. The infected crickets haphazardly jump into bodies of water allowing the hairworms to emerge and reproduce.
P.S. There is an condition called Hypertrichosis that causes a werewolf like appearance.

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The fungus you're looking for are many of the different species of cordyceps: https://en.m.wikipedia.org/wiki/Cordyceps – Ynneadwraith Mar 12 '19 at 23:36