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Language: en

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The Scientist pulls his hand away sharply, unable 
to believe his own eyes. There’s no way he just  

00:00:06.800 --> 00:00:14.280
saw what he thinks he did. The Dog’s fur couldn’t 
have… moved on its own. Perhaps it was his gentle  

00:00:14.280 --> 00:00:19.520
stroke over her coat, her skin shifting 
beneath, or… no, it’s a trick of the light,  

00:00:19.520 --> 00:00:25.400
it has to have been. How else do you explain it?
The Dog sits, unphased, clearly the same as  

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she’s always been. But a whimper reaches the 
Scientist’s ear; even a man with the strongest  

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willpower in the world would have felt his heart 
melt at the sound. She wants to be petted again,  

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and her owner quickly obliges her. Even she’s 
unaware what’s wrong with her… what’s been living  

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with her since they returned from their trip.
The Scientist offers another light, cautious pet,  

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but the Dog isn’t satisfied with such a meager 
offering. She whines again, letting him know  

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she still hasn’t received enough affection. 
So, he reaches his hand out a third time,  

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and pats it against her fur. The Dog lowers her 
head, resting it against his knee where he sits,  

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contented. Under his palm, her owner 
tussles her smooth, well groomed coat… 

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Until he feels something tiny lash at his hand.
It only lasts a split second. A fraction of  

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a moment of time, but he feels it. A quick 
sensation, like touching the barb of a bee’s  

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stinger, if only for less time that it takes 
the clock on the wall to tick. Then, it’s gone,  

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departing as quickly as it arrived, save for the 
echoes of a tiny pain in the seconds that follow,  

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each punctuated by the sound of the clock.
The Scientist looks at his palm,  

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still feeling it; or feeling its absence, he 
isn’t sure. But as far as his eyes can tell,  

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there’s nothing there. He looks at his dog, 
leans closer to her to see her fur, while  

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cautiously putting a reassuring hand on her back.
And this time, he’s close enough to see them move. 

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Shifting. Slithering. Bristling among 
the Dog’s hide, enough of them together  

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that their individual movement is 
clear to see with the naked eye. 

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It takes the Scientist a moment to realize 
his other hand, the one he’d pet his dog with,  

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had gone to his mouth in disbelief.
Now they were living on him, too. 

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Over the months that pass, he’s never once 
aware just how many there are. He never notices,  

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shaving, trimming as usual, without so much 
as a hair seeming out of place. Then, he and  

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his colleague, the Expert, start looking deeper, 
through microscopes at samples gathered from his  

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dog. That’s when he sees them for the first time. 
Dozens, too many to count. After that he dreams of  

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them, of tiny pin pricks burrowing into his skin 
at night, clawing deeper, one by one until he too  

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is just as covered in them as the Dog.
Dreams about them… or feels them. 

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After they make their findings known, a rush 
of activity follows. The Foundation and the  

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questions, they want to know all about the 
parasites. The Scientist tells them to ask the  

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Expert; he just discovered them, by accident, 
his colleague knows more about things too  

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small to see. Then, one day, after dozens spent 
answering the same questions over and over again,  

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the Scientist is told by the Foundation that he’s 
being taken elsewhere, somewhere he can help them  

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in their efforts to understand the parasites.
It’s only when he wakes up, laying strapped to  

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the vivisection table, that he realizes what his 
‘help’ will entail. The surgeons try their best  

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to calm him, but the Scientist can’t stop 
screaming. They offer platitudes and false  

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promises that everything will be alright as they 
pin down his flailing arms in their restraints.  

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The scalpels mark out segments that are then 
pulled away and put in jars, samples taken  

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to be examined under a microscope. Still, the 
scientist screams, because now he understands. 

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They’re living on him now too… 
they’re living under his skin. 

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The SCP Foundation has since given this 
parasitic species the designation of ‘SCP-189’,  

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known colloquially among personnel as the aptly 
descriptive ‘Hair Imitating Parasite’ or sometimes  

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abbreviated as ‘hairisite’. By expanding on the 
research conducted by Doctor F and Doctor W,  

00:04:13.560 --> 00:04:17.000
researchers working at the Foundation 
have successfully been able to observe  

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and track the behavior of these parasites.
Analysis has revealed SCP-189 is a type of  

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parasitic roundworm that is capable of manifesting 
in any mammalian life form from dogs and cats to  

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human beings. These parasites, as their colloquial 
name suggests, are capable of implanting  

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themselves into a creature’s body by camouflaging 
themselves as individual hairs, making them  

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difficult to detect until it’s too late…
The infection process of SCP-189 typically  

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begins when an uninfected mammal comes into 
direct contact with a creature carrying the Hair  

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Imitating Parasites. A potential new host needs to 
be within close enough range to SCP-189 egg sacs  

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in order for transmission to take place. These egg 
sacs require direct skin to skin contact as each  

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one is covered in a series of microscopic hooks. 
These hooks bear some similarities to those found  

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on the cuticles of certain species of nematodes, 
small, worm like parasites either found in animals  

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and plants, living in soil, freshwater or marine 
environments, and occasionally even in vinegar,  

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beer malts and inside water filled 
cracks deep within the Earth’s crust. 

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Upon making contact with an uninfected mammal, 
the SCP-189 egg sacs will become anchored to the  

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surface of a new host’s skin via these microscopic 
hooks. These eggs do, however, require a specific  

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catalyst to hatch. Rather than new SCP-189 
parasites being born the moment the egg sacs  

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transfer onto skin, they won’t emerge until coming 
into contact with a specific substance: sebum. 

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Unfortunately, sebum is most commonly found 
in skin. Produced by sebaceous glands beneath  

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the surface of the skin where hair follicles 
are present, sebum is an oily substance that  

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prevents skin from drying out, and plays a vital 
role in maintaining a healthy skin barrier. While  

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excess sebum can be cleared using a thorough 
skincare routine of cleaning and moisturizing,  

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this does little to deter infections of SCP-189.
Sebum will prompt anchored egg sacs to hatch,  

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at which point the larvae inside will emerge and 
burrow into nearby hair follicles. Given the tiny,  

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unobservable size of both the egg sacs and the 
emergent hairisitic larvae, it is impossible  

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to feel an SCP-189 infection as it occurs. Once 
burrowed beneath the skin inside a hair follicle,  

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an SCP-189 larva will latch itself onto the 
base of the dermal papilla, beneath the root  

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of a hair, located under the skin.
Papilla are fed by capillaries,  

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the smallest and most delicate blood vessels 
of the vascular system. These transport blood,  

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nutrients and oxygen to the various cells 
in mammalian organs and bodily systems,  

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including supplying the papilla with the necessary 
ingredients to stimulate hair growth. Despite  

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exactly how this has occurred, SCP-189 larvae have 
evolved to use the capillaries as a food source,  

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as it grows over the course of two to three days.
After this point, the now adult SCP-189 instance  

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will have grown large enough to detach itself from 
the papilla. The fully matured worm will sever the  

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hair fiber and essentially uproot an existing 
hair to quickly and discreetly take its place.  

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As a fully developed adult SCP-189 instance, 
the parasite will fully envelop the papilla and  

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the surrounding hair matrix, and then from that 
point onwards will feed on cells that are shed by  

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the hair matrix. While these cells would, in an 
uninfected subject, form the hair fiber itself,  

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an SCP-189 worm will use these to continuously 
grow longer without the subject’s knowledge. 

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Currently, SCP Foundation researchers are still 
baffled by how exactly this species of roundworm  

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could have evolved, given how seamlessly it 
exploits the ordinary cellular behaviors of human  

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beings and other mammals. Some theories among 
personnel suggest that SCP-189 was originally  

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specifically biologically engineered to harness 
and feed on the typical hair growing process,  

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by someone with in depth knowledge of how 
this bodily function occurs. There is,  

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however, no evidence to support this notion, 
and staff are discouraged from speculating  

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that these parasites were created 
intentionally via any anomalous means. 

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While the remainder of the parasite exists 
beneath the skin, the only visible part of  

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an adult SCP-189 instance is the worm’s ‘tail’ 
that extrudes outwards from the hair follicle  

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inhabited by the parasite. The tail, resembling 
a hair, is able to camouflage itself by absorbing  

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the pigments and keratin from the cells the 
parasite consumes. Keratin especially, as this  

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is the protein that helps with the healthy growth 
of hair – as well as nails and the epidermis,  

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the skin’s outer layer. SCP-189 uses the body’s 
natural keratin to form an outer cuticle,  

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a thin protective layer that matches the 
pigmentation of an infected subject’s hair. 

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This allows for the parasites to avoid detection, 
as they are not only able to match the color of  

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their host’s hair, but the extruding tail of an 
SCP-189 worm is similar in diameter and length  

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to a hair that would normally grow out of the 
follicle the parasite is burrowed into. Visually,  

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this makes SCP-189 instances indistinguishable 
from normal hairs, unless inspected more closely,  

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through the use of a microscope. Otherwise, 
a subject that has contracted an SCP-189  

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infection will be completely unaware 
that they are carrying an anomalous  

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parasite… apart from under certain circumstances.
For reasons that the Foundation is still yet to  

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understand, while most instances of SCP-189 remain 
undetectable and are indistinguishable from hair,  

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others will occasionally move independently. Some 
specimens of SCP-189 worms have been observed  

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flexing their tails, coiling or uncoiling and 
lashing their hair like extrusions in response  

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to certain tactile stimulation. It is unclear why 
some instances of these hairisites will seemingly  

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attack other organisms, and this behavior has 
only been observed in a handful of specimens.  

00:10:04.960 --> 00:10:09.120
Some Foundation experts in anomalous 
parasitology have suggested that the  

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movements could be an involuntary response by the 
parasites to external stimuli, while others argue  

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that it only occurs when an SCP-189 instance is 
threatened. Certain other proposed explanations  

00:10:21.240 --> 00:10:26.920
for these movements have been expunged from 
the SCP Foundation archive’s entry on SCP-189. 

00:10:26.920 --> 00:10:31.600
Unfortunately for those infected, and 
alarmingly for those who have observed them,  

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SCP-189 infections are in no way benign. 
Far from it actually, as instead of simply  

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nestling under the skin and feeding on cells 
indefinitely, once SCP-189 parasites reach  

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adulthood they will begin the next phase of their 
life cycle. Similarly to other documented species  

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of roundworms, SCP-189 instances are capable 
of creating and fertilizing their own eggs,  

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producing between one and three at a time, which 
are then contained within a protective egg sac,  

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ready to be passed onto the next available host.
The egg sacs themselves are similarly difficult  

00:11:06.600 --> 00:11:11.040
to detect, as they are incorporated into the 
extruding tail that extends from beneath the  

00:11:11.040 --> 00:11:16.800
skin. Once they become part of the hair-like tail, 
the egg sacs will develop their microscopic hooks  

00:11:16.800 --> 00:11:22.680
as they mature, then once the tail grows to over 
a millimeter above the surface of the host’s skin,  

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they will be primed to pass on to a new subject. 
Fully developed SCP-189 egg sacs are loosely  

00:11:28.600 --> 00:11:33.320
embedded in the tail’s cuticle and once they come 
into contact with the surface of a suitable host,  

00:11:33.320 --> 00:11:38.640
its hooks will latch onto their skin and allow 
it to be pulled free from its parent. However,  

00:11:38.640 --> 00:11:45.000
this process doesn’t exclusively result in SCP-189 
egg sacs passing from one host to the next;  

00:11:45.000 --> 00:11:49.080
if the hooks are able to embed themselves 
in the skin of the current, existing host,  

00:11:49.080 --> 00:11:53.200
then these unhatched larvae will spread 
onto the original subject, allowing the  

00:11:53.200 --> 00:11:58.680
parasites to further infest a single mammal 
if they are unable to transfer to a new host. 

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Now, Foundation researchers have discovered that 
SCP-189’s camouflage, appearing as ordinary hair,  

00:12:04.560 --> 00:12:10.120
can be used against these parasites. As one 
might expect, the tails that extrude from a  

00:12:10.120 --> 00:12:15.400
host’s skin aren’t any thicker or more 
durable than ordinary hair. Similarly,  

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the head, buried beneath the skin in the hair 
follicle is not attached any stronger than  

00:12:19.640 --> 00:12:24.640
the root of an ordinary hair. This means that, 
provided the Foundation are able to identify an  

00:12:24.640 --> 00:12:30.960
SCP-189 infection before the worm produces eggs 
and either spreads or further infects the host,  

00:12:30.960 --> 00:12:36.120
there is the possibility for the parasites to 
be removed. Much like the hair it imitates, the  

00:12:36.120 --> 00:12:41.840
hairisite’s tail can be broken or cut off, or the 
entire organism can be plucked out, or otherwise  

00:12:41.840 --> 00:12:48.000
removed in the same way that ordinary hair can be.
Once severed, the tail portion of an adult SCP-189  

00:12:48.000 --> 00:12:54.040
parasite can regenerate, growing a new head, 
becoming a separate instance of the worm. However,  

00:12:54.040 --> 00:12:59.240
this is only possible if they are able to attach 
to a new host, otherwise they will starve and  

00:12:59.240 --> 00:13:04.240
expire without access to capillaries of 
cells to feed on. Given that instances  

00:13:04.240 --> 00:13:09.160
of SCP-189 that have their tails cut off 
can simply regrow this part of themselves,  

00:13:09.160 --> 00:13:15.280
extraction of the entire organism is recommended 
by the SCP Foundation’s trichology experts. 

00:13:15.280 --> 00:13:21.520
Hair follicles containing active SCP-189 parasites 
can all die, owing to completely natural causes  

00:13:21.520 --> 00:13:27.240
and conditions that can trigger hair loss. Any 
event that causes the loss of a follicle’s hair  

00:13:27.240 --> 00:13:33.360
similarly removes an SCP-189 parasite, forcing 
them to detach from their hosts, after which point  

00:13:33.360 --> 00:13:37.960
they will usually die within an hour, although 
can last as long as six while separated from  

00:13:37.960 --> 00:13:44.520
their previous host. Even dead adult instances 
of SCP-189 can pose an infection risk though,  

00:13:44.520 --> 00:13:49.560
as the eggs that produce can remain viable for 
several years, meaning even if a new subject  

00:13:49.560 --> 00:13:55.720
comes into direct contact with a deceased SCP-189 
worm, its egg sac can still embed its hooks into  

00:13:55.720 --> 00:14:03.040
their skin and pass on the parasitic infection.
By far the most alarming characteristic of SCP-189  

00:14:03.040 --> 00:14:09.240
are their effects on an already dead mammal. 
Even if a host dies, SCP-189 specimens will  

00:14:09.240 --> 00:14:13.680
continue to survive and feed on what is left 
of the creature’s body by burrowing into their  

00:14:13.680 --> 00:14:19.680
tissues. This can allow the parasites to continue 
to produce eggs and spread over the corpse,  

00:14:19.680 --> 00:14:25.440
however only until the deceased host begins 
to decay. Once this inevitable process begins,  

00:14:25.440 --> 00:14:31.920
SCP-189 worms are killed by the toxins produced 
as the body breaks down post mortem. However,  

00:14:31.920 --> 00:14:37.800
they are still able to pass on to any that come 
into contact with the corpse before decay begins;  

00:14:37.800 --> 00:14:42.520
in cases of SCP-189 infections in humans, 
coroners and morticians examining and  

00:14:42.520 --> 00:14:48.440
handling bodies carrying the parasites quickly 
become the new host for hairisite larvae. 

00:14:48.440 --> 00:14:53.240
While their name has been expunged from Foundation 
records, the doctor responsible for the discovery  

00:14:53.240 --> 00:14:58.360
of the SCP-189 parasites certainly wouldn’t 
be quick to forget what they had uncovered.  

00:14:58.360 --> 00:15:03.120
During a six month trip to a remote area of 
rainforest in a redacted part of the world,  

00:15:03.120 --> 00:15:08.360
Doctor F was intending to spend the duration of 
their time focused on their biodiversity study.  

00:15:08.360 --> 00:15:14.600
And they would have, had it not been for Kara. 
Three years old at the time, Kara was Doctor F’s  

00:15:14.600 --> 00:15:19.600
pet golden retriever, and had been brought 
along by her owner to join the expedition. 

00:15:19.600 --> 00:15:25.800
During the trip, Kara became infected 
with numerous instances of SCP-189. 

00:15:25.800 --> 00:15:31.760
As far as records indicate, Kara was the first 
known infectee of this rare species of parasite.  

00:15:31.760 --> 00:15:36.320
This initially went unnoticed by Doctor F, 
who eventually returned to the United States  

00:15:36.320 --> 00:15:41.680
with Kara alongside them. By this time, it was 
estimated that approximately eighty per cent of  

00:15:41.680 --> 00:15:47.320
the dog’s hair follicles had been infested with 
the parasites. Human beings possess five million  

00:15:47.320 --> 00:15:51.880
hair follicles over their bodies, equating to 
between eighteen hundred and three thousand hairs  

00:15:51.880 --> 00:15:58.560
per inch. On average, a dog can have fifteen 
thousand strands of hair per inch of skin. 

00:15:58.560 --> 00:16:02.600
Several days after making their return 
to the United States, Doctor F noticed,  

00:16:02.600 --> 00:16:09.840
while petting Kara, that the retriever’s fur was 
moving. Or, more accurately, the parasites were.  

00:16:09.840 --> 00:16:16.440
And the close contact likely passed on multiple 
instances of SCP-189 to the doctor. Recognising  

00:16:16.440 --> 00:16:21.680
the abnormal infection, Doctor F contacted a 
parasitologist, whose name is similarly redacted  

00:16:21.680 --> 00:16:27.520
from Foundation files. Doctor W received an 
invitation to study the newly discovered organism,  

00:16:27.520 --> 00:16:33.160
and alongside Doctor F, the two submitted 
an academic paper detailing their findings. 

00:16:33.160 --> 00:16:37.560
Upon receiving word of this paper, the SCP 
Foundation became aware of the existence of  

00:16:37.560 --> 00:16:44.400
SCP-189 and responded by arresting both Doctor F 
and Doctor W. The pair were taken into Foundation  

00:16:44.400 --> 00:16:49.400
custody and their research materials, 
anything linking to SCP-189, was seized  

00:16:49.400 --> 00:16:54.120
to prevent knowledge of these parasites being 
available to the public. While for some, being  

00:16:54.120 --> 00:16:59.080
taken into custody by the SCP Foundation would 
likely be the last anyone ever heard from them,  

00:16:59.080 --> 00:17:04.360
both Doctor F and Doctor W were instead 
recruited. Both became affiliated with the  

00:17:04.360 --> 00:17:09.880
Foundation and Doctor W was assigned to be the 
lead researcher in charge of SCP-189 given their  

00:17:09.880 --> 00:17:15.000
background in parasitology. They were stationed 
in an undisclosed location to investigate  

00:17:15.000 --> 00:17:21.840
indigenous populations of SCP-189, and determine 
solutions for their containment or extermination. 

00:17:21.840 --> 00:17:26.120
Doctor F’s whereabouts have been 
expunged from Foundation records. 

00:17:26.120 --> 00:17:30.960
Presently, the Foundation has several samples 
of SCP-189 that it keeps stored at a classified  

00:17:30.960 --> 00:17:35.800
cryogenic containment facility. Any samples 
kept at this facility that exceed an amount  

00:17:35.800 --> 00:17:41.840
the Foundation is able to contain safely are to 
be destroyed via incineration immediately. Test  

00:17:41.840 --> 00:17:45.160
subjects who have been infected with the 
parasite are kept in a sealed containment  

00:17:45.160 --> 00:17:49.720
chamber with an airlock and chemical shower. 
Personnel that interact with these infected  

00:17:49.720 --> 00:17:54.640
test subjects are required to wear standard 
NBC hazmat suits during their time inside,  

00:17:54.640 --> 00:17:58.840
and must undergo a chemical shower before 
exiting the airlock and leaving the area. 

00:17:59.680 --> 00:18:03.240
Whenever test subjects die, whether 
through the natural result of their  

00:18:03.240 --> 00:18:07.920
infection or by termination, their bodies 
must be sealed in an airtight body bag,  

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which will then be put through the same chemical 
shower prior to removal from the chamber. Then,  

00:18:12.560 --> 00:18:16.640
it is to be thrown into the incinerator. 
Should these containment measures fail,  

00:18:16.640 --> 00:18:22.280
and a staff member find themselves unintentionally 
infested with SCP-189, they are to be quarantined  

00:18:22.280 --> 00:18:27.880
in the same manner as test subjects and 
treated with anti-parasitic agent 189-A. 

00:18:27.880 --> 00:18:33.680
If any human or animal at a Foundation site is 
determined to have an infestation of SCP-189,  

00:18:33.680 --> 00:18:39.200
every living being onsite must be inspected 
according to procedure. Staff members should  

00:18:39.200 --> 00:18:44.800
then be treated, while D-Class and non-SCP 
animals must be terminated and incinerated,  

00:18:44.800 --> 00:18:50.200
after which the facility is to be cleaned 
thoroughly with anti parasitic agent 189-A. 

00:18:50.200 --> 00:18:55.600
Cases of SCP-189 found outside of the Foundation 
must be taken into custody and quarantined  

00:18:55.600 --> 00:19:00.160
immediately. Animals are to be euthanized, 
and their bodies incinerated, while humans  

00:19:00.160 --> 00:19:06.240
may be treated with the antiparasitic agent and 
administered Class C or B amnestics. Individuals  

00:19:06.240 --> 00:19:11.120
who have been or may have been in close contact 
with the infected must be checked for infestation  

00:19:11.120 --> 00:19:16.200
and treated if necessary. A document containing 
suitable cover stories may be provided upon  

00:19:16.200 --> 00:19:22.760
request, and can include covers such as gas leaks, 
bed bug infestations, and outbreaks of bird flu. 

00:19:22.760 --> 00:19:27.760
Since the initial discovery of SCP-189 and the 
Foundation becoming subsequently aware of their  

00:19:27.760 --> 00:19:32.320
existence, there have been numerous infestation 
incidents documented in various parts of the  

00:19:32.320 --> 00:19:38.840
world. The source of infections outside of the 
SCP Foundation remains unknown. Theories range  

00:19:38.840 --> 00:19:43.040
from the presumed existence of a previously 
unseen group of carriers transmitting the  

00:19:43.040 --> 00:19:48.800
Hair Imitating Parasites to new infectees, or some 
other shared point of origin for these hairisites,  

00:19:48.800 --> 00:19:54.080
with some researchers suggesting there could exist 
a Patient Zero for infections, or an organism  

00:19:54.080 --> 00:20:01.320
capable of spawning more instances of SCP-189, 
similarly to a queen in some insect populations. 

00:20:01.320 --> 00:20:06.120
A considerable number of human beings and animals 
have been confirmed to have contracted one or more  

00:20:06.120 --> 00:20:12.400
SCP-189 instances. The Foundation is working 
tirelessly to monitor outbreaks and ensure  

00:20:12.400 --> 00:20:18.320
that the public remains unaware that there could 
be anomalous hairisites living in their scalps. 

00:20:18.320 --> 00:20:22.680
Check out the Doctor Bob Patreon and become 
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00:20:22.680 --> 00:20:28.160
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like SCP-420 Aggressive Skin Condition!