Kabaneri theories by two biology nerds
Ok, I am rewatching Koutetsujou no Kabaneri and my friend is watching it for the first time with me, and we are both biology nerds, so we are trying to work out how exactly the kabane, and therefor kabaneri, work. I will be posting our thoughts and theories one episode at a time, so please keep reading these. And if you haven't watched this anime, it's great, so watch it as the fandom is too small.
Right, so in episode one we basically were just trying to work out if it is a virus/bacteria, or a parasite. We don't think it would be a virus or bacteria, as those tend to kill the hosts pretty quickly, and some of the kabane have been alive for decades. They also often make the host physically weaker, and that is clearly not the case.
So we are onto parasites. Firstly, we needed to determine if it was a parasite or parasitoid (parasitoids kill the host and parasites don't). Despite what you may think, we actually think that it would be some type of parasite, as although kabane are basically zombies, parasitoids don't stay in their hosts, and don't control them. As far as parasites go, there are many instances of parasites, animal and fungal, latching onto the hosts brain and controlling them, like the cordyceps fungus, or the tarantula hawk wasp.
So, we've determined that it's a parasite, now what? Well, how is it transmitted. Obviously, through bites, but how does it do that. We decided that depending on if it is animal or fungus based, it probably lays eggs/spores in the saliva glands in the hosts mouth, which then get into the victims bloodstream when bitten. This also means that the parasite is unlikely to be in the kabane's blood, which makes sense, as steamsmiths don't seem too worried about cleaning blood off the trains.
When a victim is bitten, the eggs/spores are released into the bloodstream, causing the infection. This then explains the slow infections, as the smaller the wound, the fewer eggs and the slower the infection. The parasite then targets the brain in order to control the new host, as well as protecting the heart. This makes sense, as the parasite would more than likely be secreting chemicals into the hosts bloodstream in order to keep it running, and give it the superhuman strength, and in order to do that, it needs the heat to work.
This also explains why they are so hard to kill (we haven't tried to work out the heart cage yet). If the parasite keeps the body running off of its own chemicals, the host doesn't need to eat, so its organs can shut down, meaning that shouting it anywhere other that the head or heart will have no effect, as the kabane doesn't need anything else to function.
The parasite theory also helps explain why Ikoma succeed in turning himself into a kabaneri. If it was a virus, as soon as he stopped cutting off the blood supply to his head, it would have continued to infect him. But with a parasite travelling through his blood, if it can't find his brain, then it might assume that it is in the wrong place, and either shut down and hibernate, or die.
Ikoma still would have gone through some physical changes, as the parasite likely releases chemicals as soon as it hatches in the bloodstream, which would permanently alter his body, sending him through the initial changes that a kabane goes through. But without the right place to live, the parasite shuts down and stops releasing chemicals, meaning that not only does he keep his mind, changes such as skin colour would likely be reversed, as he no longer has the foreign chemicals in him.
That's all we have for now, but I will keep posting our theories as we watch it, so keep an eye out if you're interested.
Part 2 is now up, pls go read it (:
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