Special Containment Procedures: 1 D-class host is to be 
maintained for SCP-3690's continued survival. Meals should consist 
primarily of liquid substitutions rather than solid food, due to the pain 
of attempting to digest solid food. While flares are not occuring, the 
host should be treated with 5-10mg of colchicine and 145-290mcg of 
linaclotide, depending on their weight. During flares, analgesia and 
NSAIDs should be added to the medication regime. When host 
requires administration of life support systems, suicide watch is to 
be implemented. 24-hour surveillance of the host is to be 
implemented following the events of 09/ 02. 


A population of Ixodes scapularis is to be kept on-site to implement 
efficient infection of a new host after the current one expires. Areas 
which the black-legged tick inhabits are to be monitored for unknown 
autoimmune conditions. Any parasites that are found in the wild are 
to be surgically removed and incinerated, and a cover story 
explaining the death of the host is to be disseminated to the next of 
kin. Due to the medical complications inherent in SCP-3690 
infection, and the specific criteria for infection, infections are easily 
spotted and contained before they become pandemic. 


Description: SCP-3690 is a parasitic organism that replaces the 
human large intestine. Outside of the human body, an instance of 
SCP-3690 most closely resembles a human large intestine, suffering 
from varying severity of inflammation. 13 pairs of prolegs on the 
underside of the body permit limited movement of the parasite, and 
allow it to attach itself to the inside of the coelum. Fleshy inclusions 
in the faux-intestinal lining occur at random intervals along the 
parasite's body, which serve to store excess host blood which the 
parasite absorbs. When these are full, SCP-3690 can survive for up 
to 6 months without a host before expiring from starvation. Surgical 


removal of the parasite is possible, but always fatal to the host. The 
human autoimmune system reacts unfavorably to the presence of 
SCP-3690, causing periodic flares, usually once every month. 
Additionally, T-cells attack the parasite itself, resulting in ulceration 
within the parasite. This autoimmune response damages 
SCP-3690's ability to replace the functions of the large intestine, and 
can even kill the parasite if not properly treated. 


The primary symptoms of the active parasite are moderate to severe 
abdominal pain, ulcers in the small intestine, diarrhea mixed with 
blood and mucus, lack of appetite, nausea, vomiting’, weight loss, 
anemia?, and a mild fever measured at 38 to 39 °C. Occasionally, 
SCP-3690 will slightly change position within the body; this is not 
painful, but often causes distress in the host. These symptoms are 
continually present even outside of flares. With proper maintenance, 
hosts can survive for as long as healthy, non-anomalous humans, 
although the quality of life is greatly reduced. Colchicine treatment 
slightly improves these symptoms, along with suppressing attacks. 
The exact way in which colchicine suppresses flares is unclear, but 
the improvement of symptoms along with flare suppression 
markedly improves quality of life. Even with colchicine treatment, 
however, the quality of life will continue to worsen over time until 
they require constant medical attention. Even with proper 
maintenance, the host may spend several decades confined to the 
bed before they finally expire. 


Flares develop over 2—4 hours and can last anywhere from 6 hours 
to 2 weeks. During a flare, the entire abdomen is affected with all 
signs of peritonitis, acute inflammation of the small intestine, and 
acute abdominal pain. Additionally, bowel movements are 
accompanied by painful abdominal cramping. Prolonged parasitic 
exposure causes flares to also induce pleuritis; pre-existing 
conditions can reduce the exposure time necessary for pleuritis to 
occur. The fleshy inclusions on SCP-3690 break the outer layer of 
its skin during flares, releasing the stored blood into the coelum. The 
purpose of this is unclear. These flares are by their nature self- 
limiting, but require analgesia and NSAIDs3 to treat the resulting 
symptoms. Left untreated, the chronic flares will cause the patient to 
weaken and expire over a long period of time as their joints and 
digestive system incur more damage than the body is capable of 


healing. 


The parasite is transmitted through the observation of tick bites, 
specifically the bites of Ixodes scapularis, but only after an instance 
has fed on a host already infected with the parasite. Due to the 
relative inconspicuousness of tick bites when not affected by Lyme 
disease, SCP-3690 is often transmitted by a bite which displays the 
characteristics of Lyme disease. During the next REM sleep cycle, 
an instance of SCP-3690 will manifest in the coelum of the new 
host. It consumes the entirety of the large intestine, and attaches 
itself by its mouthparts to the ileocecal valve, where it feeds off of 
the host's blood while acting as a non-anomalous large intestine. It 
will continue to do so until the host expires. Once SCP-3690 can no 
longer feed, it will detach itself, exit the host through the digestive 
system, and attempt to locate a new host. However, due to the fact 
that SCP-3690 has no way to enter the coelum of a new host, it can 
only attach itself to the outside of the human body. After 36 hours 
outside of a host, or after the blood reserves have been depleted, 
SCP-3690 will vanish completely. It is unknown as to where 
SCP-3690 departs to, or where it manifests from upon infection. 


The first instance of SCP-3690 was discovered in ; , after 
routine record-checking of the state hospitals uncovered a patient 
suffering from an unknown autoimmune condition. Medical scanning 
revealed the presence of SCP-3690, and the host was quarantined 
pending SCP designation. When the host's child began displaying 
similar symptoms, the entire family was brought into containment. 
Surgical intervention on the younger host proved unsuccessful, but 
provided new information about the parasite. The removed parasite 
survived for 6 months before finally vanishing. An analysis of the 
symptoms displayed by the host of SCP-3690 compared with lists of 
patients with unidentified autoimmune disorders revealed several 
other infectees, with a statistical imbalance towards doctors and 
families in areas where Lyme disease is common. Interviews 
revealed that the infectees had not necessarily been infected with 
Lyme themselves, but had observed the bite of someone who had. 


Prolonged D-class testing was approved on 01/ / 97. 


+ Host Interview 11/ / 01 


Interviewed: D-15756 
Interviewer: Dr. Bradley 
<Begin Log> 


Dr. Bradley: On a scale of one to ten, how 
would you rate your pain level, D-15756? 


D-15756: Eleven. 


Dr. Bradley: Please take this seriously, 
D-15756. 


D-15756: I'm the one being murdered by my 
intestines. | hurt. I'm fucking tired of hurting. If 
this interview is going to convince you 
bastards to help us stop hurting, I'll take it as 
seriously as a death sentence. It's an eleven. 
Go on, write that down. 


Dr. Bradley: If you continue to be hostile, we 
will move on to the next D-class. 


D-15756: You want to know what this is like? 

You want to fucking know what this is like? It's 
hell. | throw up blood. | shit out blood. | think | 

bleed more than is in my actual fucking body! 

|- 


[D-15756 begins retching] 
Dr. Bradley: Please calm down, D-15756. 


[D-15756 manages to get himself under 
control, and takes a deep breath] 


D-15756: Fuck you. And fuck you for telling 
me to calm down. You don't get to fucking look 
down your nose and condescend at me 
because | dared to tell you that I'm in fucking 
pain all the time. You're not the one in pain all 


SCP-479: Hallway 4, D-Class Dorms, Site 14 


Item #: SCP-479 
Object Class: Euclid 


Special Containment Procedures: A Site 14 standard 2mm CR4 
double skin steel plate security door (UNI 9569 Class 3) with full 
gasket seal is installed on either end of Hallway 4. Both doors are to 
be kept locked, and keys retained by the ETHB on duty. D-class 
personnel authorized to enter for the purposes of surveying and 
research. Hallway 4 is no longer authorized as a thoroughfare 
between the D-class laundry and plant room. 


Sweeps of Site 14 looking for similar phenomena will continue to 
supplement regular security sweeps until further notice. 


Description: Hallway 4 is a 25m long hallway connecting the plant 
room in the Site 14 D-class dormitories to the laundry room. As of / 
/20 , persons entering Hallway 4 have mentioned powerful visual, 
auditory and olfactory hallucinations of blood, ranging from isolated 
blood spots on the floor to "blood raining upwards, hitting the floor 

from the other side like it's the pane of a window". 


These visions of blood have been proven to be hallucinations. The 
floor at the time of the first report was plain bare concrete and no 
evidence of blood can be found by chemical or photographic means. 
Some ordinary rust was found, but not in the quantities or locations 
reported in the hallucinations. The ground under Hallway 4 is the 
same volcanic bedrock that the rest of Site 14 rests on, proven so 
after a D-class team excavated it with hand tools and a new 
reinforced concrete floor was poured. A thorough investigation of the 
walls and ceiling also turned up negative results. 


No abnormal chemicals are present. Neurological analysis of D- 
class subjects with no prior history is pending, but so far looks 
inconclusive. Antipsychotic medication is ineffective. 


the time. 
[D-15756 suppresses a sob] 
Dr. Bradley: D-15656, please- 


D-15756: You don't wallow in your own blood 
and shit and vomit until someone comes 
around to clean you up. You don't smell like 
the backside of a morgue. You don't look in 
the fucking mirror and barely recognize 
yourself because you're dying too slowly to 
actually die. You don't cry every time you have 
to get up to take a piss because your legs feel 
like they're from some porcelain fucking doll. 
You don't bawl your eyes out because you're 
shitting out blood, you've been shitting out 
clumps of blood and mucus and nothing else 
for years now, and you're going to keep 
shitting out blood and mucus in the most 
painful way possible until it fucking kills you. 


[D-15756 begins shouting] 


D-15756: You don't get pitied one moment and 
then treated like shit the next because how 
dare | be unable to do things when my fucking 
intestines are trying to fucking kill me! How 
dare | ever tell one of you fuckers that | hurt! 
How dare I-! 


Dr. Bradley: | believe we're done here. 
Security! Please take this one away, and bring 
in the next host. 


<End Log> 
+ Research Program Log 


01/ / 97: D-class subjects infected by 
having them observe an infected tick bite. 


06/ / 97: D-15756 attempts suicide. 
Containment procedures updated to include 
suicide prevention procedures. 


07/ / 97: NSAIDS tested for their usage in 

reduction of pain and inflammation. This is the 
first successful medication regimen to alleviate 
some of the symptoms of SCP-3690 infection. 


09/ / 97: Therapy sessions deemed 
ineffective in reducing suicide attempts or host 
distress. Therapy discontinued. 


03/ / 98: D-14925 suffers from septic shock 
caused by prolonged inflammation of the small 
intestine trapping intestinal contents in close 
proximity to intestinal ulcers. SCP-3690 
released a chemical similar in structure to 
vancomycin as soon as sepsis occurred. 
Septic shock was not prevented; however, the 
host did not expire. Hosts are now to be 
medicated with linaclotide to prevent sepsis 
during flares. 


05/ / 98: D-16742, a vegan, expires due to 
malnutrition. It is discovered that SCP-3690 is 
less effective than a non-anomalous large 
intestine at properly absorbing the nutrients of 
vegetable proteins. Host diets altered to 
maximize parasite health. 


04/ / 99: Multivitamin regimen started, due to 
poor nutrient absorption while recovering from 
flares. Liquid dietary replacements tested. 


05/ / 99: Liquid dietary replacements 
discovered to be easier on SCP-3690 and 
hosts, but not currently able to replace a full 
diet. However, as the liquid replacements were 
less likely to induce vomiting or other 
gastrointestinal distress, they were cleared for 


use in combination with an increased 
multivitamin regimen. 


11/ / 99: D-15756 attempts suicide by 
medication overdose. The SCP-3690 instance 
induces vomiting immediately. Careful testing 
reveals that ingested poisons are vomited 
back up again, or neutralized if vomiting 
cannot be induced. Testing on poisoning 
ended due to increased host distress. Suicide 
prevention protocols adjusted. 


05/ / 00: All hosts permanently bedridden. 
Suicide prevention protocols adjusted. 


07/ / 01: Suicide attempts prevented by 
current protocols breaks the triple-digits. 
D-15756 alone has made _ attempts. 


09/ / 02: D-15756 used eating utensils to 
commit murder-suicide of himself and the rest 
of the bedridden subjects in the 3690 
containment area. Security increased and 
stricter suicide prevention protocols 
implemented. New hosts infected with 
SCP-3690. 


11/ / 05: Colchicine treatment was discovered 
to increase quality of life in D-class subjects. 
Colchicine approved for use in the research 
program. 


01/ / 15: It was determined that the excess of 
hosts was unnecessary to containment and 
research. D-class program downsized to 1 
host, and excess parasites incinerated. 


04/ / 17: D-18213, the host of the contained 
instance of SCP-3690 at that time, was found 
to have expired during the night. A post- 
mortem autopsy discovered that SCP-3690 


was no longer in the host's digestive system, 
and that the cause of death was shock and 
internal bleeding caused by the sudden lack of 
a large intestine. A search of Site- was 
conducted, and after 18 hours, SCP-3690 was 
found in the crawlspace accessing the 
plumbing system, having gotten trapped ina 
roach motel during its escape. SCP-3690 was 
recovered and incinerated, and a new host 
infected. It is unclear at this time as to what 
motivated SCP-3690 to attempt to relocate 
itself. 


Footnotes 

1. To the point where long periods of time may go between the host 
consuming any substantial solid food. 

2. Anemia induced by the parasite does not require blood 
transfusions unless other disorders are present. 

3. Such as diclofenac. 


SCP-3692: the notebook 


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