The idea that Vampirism is a product of a parasite is not so much science fiction, but more science fact. But reader, please do not think that I am deliberately trying to dupe you. I will not talk about endogenous viruses, recessive genes or wow you with scientific looking words I plucked from Wikipedia. You can find all of the information below by using your brain, some logic and a search engine. Then you will have an opinion which can be used to engage in argument. But please remember the basic principle of science, that science is a methodical process used to determine the secrets of the natural world, and as such theories and ideas are ever-evolving, which brings about new hypotheses to test.
Before I explain how we can become infected, it is important that you read the patterns of behaviours observed in some insects and animals.
Evidence in animals and insects:
The juvenile Gordian hair worm Spinochordodes tellinii changes the behavior of the grasshoppers it infects so that they are more likely to jump into water and drown so that the worms can burrow out of the hapless insect and continue its life cycle as a free swimming adult.
The fungi in the genus Cordyceps infect ants. Their spores land in the tracheal tubes (respiratory canals of insects) and begin to grow into the ant's body. Once the fungi has grown to maturity and is ready to propagate, it begins to grow in the direction of the ant's brain, eventually infesting it. As it grows into the ants brain, it releases chemicals so that the ant is driven to climb up and up to the highest point that it can. Once it has, it will clamp its mandibles onto the plant surface and simply wait for the fungus to finish digesting what is left of the ant. The Fungus then grows a stalk out of the head of the ant, releasing its own spores that, in the breeze that the ant found for it, can float out and infect other ants.
Another parasite of ants, the lancet fluke Dicrocoelium dendriticum, alters the behavior of its host a bit more selectively. When night comes, the fluke takes control of the ant, forcing it to climb up blades of grass and clamp down with its mandibles. There it waits for grazing mammals such as cattle to come by and eat the grass and the ant along with it. It can then go on to infect its primary hosts liver. If the ant the fluke has commandeered was not eaten in the night, it will relinquish control of the ants nervous system back to the hapless host so that it may go back to its daily business none the wiser and keep the fluke larvae alive and fed for another day, only to repeat the cycle the next night.
The wasps of the genus Glyptapanteles hunt down caterpillars in the Brazilian rain forest. When it finds a young geometrid caterpillar, it lays its eggs inside it and then flies off leaving the caterpillar relatively unharmed. But soon the eggs hatch and the larvae begin feeding on the their hosts fluids. After growing inside their host's body for a while, they eat their way out. But the wasp larvae are not done with the caterpillar yet. A few of the larvae remain behind to take control of the caterpillar entirely. The now 'zombified' caterpillar spins its own silk around the larvea that burst out from it earlier. It makes a cocoon for each one. It then guards the brood against invaders, thrashing at anything that might come to harm its 'family'. The caterpillar stands guard until the larvae hatch and fly off as adult wasps. The larvae still inside, controlling the caterpillar, have sacrificed themselves so that their siblings can grow properly, as they will die inside their host when the host itself dies.
Another parasite Toxoplasma gondii, targets rats. Its primary host is a cat, but it cannot get into a cat directly. So it alters the brain of the rat so that instead of fleeing at the scent of a cat, it actually seeks it out. Focusing on the sent of urine left by the cat the rat runs towards it completely unafraid. When it is eaten by the cat, the parasite can continue its life cycle.
Oddly enough, there is some speculation amongst neurologists, parasitologist and other such researcher that when Toxoplasma gondii accidently finds itself infecting humans that it begins to alter our own behavior. Many people are infected by Toxoplasma but most won't show any symptoms, but if the parasite encysts in the brain, changes may occur. While it is not entirly concrete yet, it seems very likely that these parasites cause a form of schizophrenia and possibly bi-polar disorder in its host.
These are all cases of parasites controlling their hosts to some degree or another.
Credit is due to my gothic ally in the US, Chris.
Note: some sites suggest vampirism is down to a disease called Porphyria and that being anaemic is another reason why vampirism exists. This is nonsense - those unfortunate people with the disease deserve more credit. They are sick and suffer increadible pain.
The creation of a parasitic second heart:
Below is an image purely for illustration, I haven't the guts to approach a medic with my condition for feat that I will never return from the operating theatre. The myth of the Sampiro involved the presence of two hearts. When I killed Ed, I ripped out what I thought to be his heart, but instead I found a flacid grey parasitic organism that had symbiotically attached itself to the real organ. If you think you've been infected, you'll feel a heart murmur, a bit like a constant heart palpatation or an echo to your beat (effectively 3 beats). I know that there's one inside me, and to Michael's surprise I have managed to contain it. That's what makes me different to all the others and why they want me dead.
Increase of mental illness (including Schizophrenia and Bi-Polar Disorder), plus the increase of suicide amongst young men.
This is the most troubling aspect and one which I can now link to the collective, a side effect of ant transformation. A reaction to the parasite can induce intensified physical and mental awareness. Research the facts for yourself, but take it from me - the urge to kill and feed can consume you to the point of madness!
The mood swings as quoted in the video include the desire to feed and give in to a powerful inhibition - the vampire within!
The increase of suicide amongst young men is linked to the selection process of the collective; they prefer young and impressionable men as they are at the prime of their success and, once transformed, are able to collect prey more readily for habitual feeding in secret London basements.
Everything on this world has a magnetic field, be it living or non living. The Ants have evolved beyond humans and can control this mysterious energy, meaning they can manipulate electrical devices such as lights and recording equipment like cameras and CCTV. This is closely linked with electrical fields, I am currently consulting a scientific ally to explain what signs to look out for.
From experience, the main ones are: Flashing street lamps and electrical interference with mobile phones and radios, you will often hear a series of three bips, like an heartbeat with delay...
When I killed my first ant it was in a back alley of Soho. He didn't just explode, but I saw a bizarre chemical reaction before he combustion began. I've never watched them turn completely to ash, but this video about White Phosphorous links to how perhaps the vampire parasite requires more than 1lb that is present in regular human bodies.