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The Immune System · Chapter 7 of 7
A sunburn at two, an appendixA small, finger-like pouch attached to the cecum, thought to play a role in immune function. at fifteen, a knife in the chest at sixteen, shins on fire at ten, bones thinning at thirty-eight, a disc, a bladderA muscular organ that stores urine before excretion., a brain with spots, a heart with a rub, a gut with amyloid, a kidney that leaks, a crib that stayed empty. Every chapter of this course logged one clue and filed it alone. This chapter lays all of them on the one pathway, writes the sentence that separates autoinflammatory from autoimmune, reads the chart the way the diary asks it to be read, and logs Chart Clue #22.
The question you will answer
Twenty-one clues, each with a reasonable explanation of its own. What does it take to see that they are one — and what would it have taken in 1990?
Opener · One Gene, Every Organ · about 2¼ minutes
The opener is the same narrated animation you will watch in Scene 3.
Watch the opener first. It sets the question; the chapter answers it.
1
Read the chart
Patient chart · Stina
1977 → 2026 · ages 2–51
Fever + serositis
#1 fever at 2 · #1 appendix at 15 · #15 pericarditis at 33 and 44 · #17 peritonitis, amyloid gut · #18 pleurisy at 16, 34, 45
Skin, bone, muscle
#5 five rashes, one fire · #6 shins at 10, DEXA at 38, sterile synovitis · #7 post-attack exhaustion
Nerves and senses
#8 neuropathy · #9 the disc and the cytokine pain · #10 white-matter spots · #11 the bladder, the face, the hearing
Hormones, blood, vessels
#13 calcium, cortisolA glucocorticoid involved in stress response, metabolism, and immune regulation., vitamin D · #14 erythrocytosis, MGUS, the acute-phase alarm · #16 vessels aging too fast
Kidney, fluids, reproductionThe process of producing offspring.
#19 proteinuria, Congo red · #20 edemaExcess fluid in interstitial spaces., low albuminA plasma protein that helps maintain osmotic pressure and transport substances., corrected calcium · #21 bleeding, infertility
Immunity
#22 MEFV VUS + LPIN2; ANA/RF/dsDNA negative; cultures sterile; reactive nodes, working spleen; AA amyloid in gut and kidney — one innate pathway.
Chart clues this module: 1–21 · the course · 22 · this chapter
Before you go on · your prediction
Twenty-one findings across eleven organ systemsGroups of organs that work together to perform functions. over forty-nine years. The most defensible reading is…
Open the one you lean toward. Nothing is recorded and nothing is revealed — you come back to it at the end.
Twenty-one unrelated problems in an unlucky patient — bodies accumulate diagnoses
Ask what the odds are that twenty-one problems share a fever, a timing and an acute-phase signature by chance. Then ask what “unlucky” costs when it is written in a chart.
One innate mechanism — a loose brake, a ringing bell, a liver that answers — expressed organ by organ
Ask what each clue needs to be caused by IL-1β, IL-6 and SAA, and whether any clue on the board needs anything else. Watch for the one or two that the case still labels hypothesis.
An autoimmune disease that was never properly tested for
Ask which test was never done. Then count the ANAs.
2
The story
Three short movements: the case, the anatomyThe study of the structure of the human body. and physiologyThe study of how the body functions., then the tie back to Stina. Each links to the scene where you’ll see it move.
I · Twenty-one clues, filed alone
Each clue came with a reasonable word. The appendix was “early appendicitis”. The chest at sixteen was “anxiety”. The shins were “growing pains”; the bones were “perimenopause”; the numb feet were “the accident”; the spots on the brain were “migraine”; the rub over the heart was “reflux”; the protein in the urineThe liquid waste excreted by the kidneys. was “a little, recheck it sometime”; the empty crib was “bad luck, or stress”. Ten doctors, ten folders, ten tidy explanations, and one person who had read all ten. In September 2026 a dermatologist read “familial Mediterranean fever” on her problem list and said she must be so relieved. A name gives you words. It does not give you years.
See it move: Scene 1 · The Board · Scene 4 · Reading the Whole Chart
II · One pathway, every clue
Lay the pathway from Chapter 6 across the board and every clue lands on it. The IL-1β surges are the fevers (Clue #1), the serositis of peritoneumThe membrane lining the abdominal cavity and organs., pleuraThe double-layered membrane surrounding the lungs and lining the thoracic cavity. and pericardiumThe membrane surrounding the heart. (#1, #15, #17, #18), the sterile synovitis (#6), the post-attack exhaustion of muscles run as a furnace for three days (#7), the autonomic instability and cytokine-driven pain (#9, #11), the neutrophilic skinThe body’s largest organ, providing protection and regulation. — Sweet syndrome, pustules, erysipelas-like shins (#5) — and the neuroinflammation behind the white-matter spots (#10). The IL-6 is the acute-phase alarm (#14), the osteoclasts eating bone (#6), the flat cortisol and wandering calcium of an endocrine systemThe organ system consisting of glands that secrete hormones to regulate body functions. reset by inflammation (#13), the heavy bleeding and the infertility of a uterusThe muscular organ where a fertilized egg implants and develops. and ovary bathed in it (#21), and the vessels aging too fast (#16). The SAA is the amyloid: in the gut wall (#17), in the glomeruli (#19), and the proteinuria, low albumin and edema that follow (#19, #20). The erythrocytosis and the M-spike (#14) are the two threads the case holds apart — one explained by a kidney under amyloid making the wrong amount of EPO, the other a clone of undetermined significance — and the lectin and the neuropathy (#8) are the threads it labels partly explained. One gene names the protein; one protein lights the pathway; one pathway writes the chart. Nothing on the board needs a second mechanism, and the case says so only as far as the evidence does.
See it move: Scene 1 · The Board · Scene 2 · Autoinflammatory, Not Autoimmune · Scene 3 · One Gene, Every Organ
III · Autoinflammatory, not autoimmune — and what would have helped
The sentence this module exists to teach: an autoimmune disease is the adaptive arm targeting self — autoantibodies, self-reactive lymphocytes, positive serology, gradual onset, chronic destruction, a response to immunosuppression; an autoinflammatory disease is the innate arm firing without a target — no autoantibodies, abrupt stereotyped fevers, sterile inflammation, complete resolution, and a response to IL-1 blockade rather than to immunosuppression. FMF is the prototype of the second. Her six negative ANAs were not an absence of evidence; they were the evidence, and the category they left standing was one that no autoimmune panel is designed to find. Chart Clue #22 is the mechanism — and the lesson the diary asks the course to end on is not about pyrin. Read the whole chart, not today’s visit. Treat ancestry as a probability, not a rule: the boat ticket was never a lab test. When you order a test, follow up on the result: page two is part of the report. When you do not know, say so and find out; silence is not neutralA solution with a pH of 7.. A symptom that comes back is not a personality, and neither is the woman describing it. There is no guideline for her pair of genes, and there was no guideline needed for her chart: two major criteria were on it by 1991. The study of one is the point of the course.
See it move: Scene 2 · Autoinflammatory, Not Autoimmune · Scene 4 · Reading the Whole Chart · Scene 5 · The Study of One
3
Watch · explore · think · check
5 scenes. Each one has a short animation or a slide, something to explore, a true/false spot-check of your thinking, and a quick check. Every scene gives you an evidence card for your board.
How to read the scenes
- Animation (dark teal) — a short animated explainer, one idea each
- Slide (dark teal) — a still to study: a micrograph, a diagram or a map
- Explore (purple) — something to push on while you watch
- Game (purple) — a quick challenge
- Think (gold) — reason it out, then spot-check yourself with a few true/false questions; not graded
- Check (gold) — a quick H5P that scores itself
Scene 1 of 5
The Board
Every clue, every organ, one timeline.
Slide · in production
Twenty-One Clues on One Timeline
The chart was legible from the first entry. It was just never read as one document.
Prefer the full lecture? Adaptive versus Innate Immunity (original video on the site)
Explore · in production
Read it as one document
The board with every clue face-down. Turn them in the order they happened and, after each, write the earliest year at which the chart met two major Tel-Hashomer criteria; the model keeps its own count and shows it only after yours. Then the second pass: drag each clue onto the pathway link that explains it — IL-1β, IL-6, SAA, or “separate thread” — and find the ones the case leaves partly explained. Nothing is recorded.
Think · not graded
By which year did the chart contain two major criteria — and how many clinicians had seen it by then? What single habit, applied by any one of them, would have ended the case thirty-five years early?
The true/false spot-check for this prompt is in production.
Check · Timeline
Place the chart clues on Stina’s timeline.
This self-scoring check is in production.
Evidence card 1
Add it to your evidence board
Twenty-one clues on one board, two major criteria by 1991, a name at 51.
Scene 2 of 5
Autoinflammatory, Not Autoimmune
The sentence in one breath.
Animation · in production · 1 min 50 s
Autoinflammatory, Not Autoimmune
Two columns built live: autoimmune — adaptive arm, self-antigen, autoantibodies, positive serology, gradual onset, chronic destruction, immunosuppression; autoinflammatory — innate arm, no target, no autoantibodies, abrupt stereotyped fever, sterile inflammation, complete resolution, IL-1 blockade. FMF as the prototype. Her chart lines placed one by one in the right column. “Six negative ANAs were not an absence of evidence.”
Prefer the full lecture? Auto-Immune Diseases (original video on the site)
Game · in production
Two columns
Twelve feature cards shuffled — autoantibodies, sterile fever, gradual onset, IL-1 blockade response, immune complexes, 72-hour resolution, Th17 drive, pyrin, positive ANA, no memoryThe ability to store and recall information. effect, tissue destruction, stereotyped attacks. Sort into autoimmune or autoinflammatory, then place three diseases (lupus, psoriasis, FMF) and defend the hardest one (psoriasis sits between). Last: write the distinction in one sentence of your own before the model’s appears.
Think · not graded
Psoriasis — which she has had twice — is usually filed as autoimmune and runs on IL-23 and IL-17. FMF is autoinflammatory and runs on IL-1β. Both are “immune”. Explain to a patient why the two words are not the same, why the treatments differ, and why her serology was clean despite the plaques.
The true/false spot-check for this prompt is in production.
Check · Drag the Words
Rebuild the sentence that separates the two.
This self-scoring check is in production.
Evidence card 2
Add it to your evidence board
Six negative ANAs were the evidence: the innate arm, firing without a target.
Scene 3 of 5
One Gene, Every Organ
The capstone.
Animation · in production · 2 min 10 s
One Gene, Every Organ
The body outline. The brake comes off in a neutrophil; the bell rings; the pathway lights IL-1β → IL-6 → SAA. Organ by organ, each clue card flies to its link: serous membranesThin tissues that line body cavities and secrete fluid., skin, synovium, muscle, nerves, bone, endocrine set points, vessels, uterus and ovary, gut wall, glomerulusA network of capillaries in the nephron where blood filtration occurs.. The two threads held apart (erythrocytosis via the kidney; MGUS) and the two labelled partly explained (neuropathy; the lectin). Colchicine and IL-1 blockade cutting the chain. The last line: “It was all there.”
Prefer the full lecture? Antimicrobial Proteins (original video on the site)
Explore · in production
Wire the body
A body with eleven organ systems and one engine. Draw the wire from the engine to each system and label what travels on it (IL-1β, IL-6, SAA); the body lights the organ when the label is right. Then the honest round: three cards — erythrocytosis, MGUS, the lectin — to place on “explained via another organ”, “separate”, or “partly explained”, before the case’s own placement appears. Last: the one organ the fire never touched, and what its tests showed every time.
Think · not graded
A single mechanism that explains twenty-one findings is either the truth or a very good story. Name the two findings the case refuses to put on the pathway, say why that refusal makes the rest more credible, and say what you would test in the next five years to tell truth from story.
The true/false spot-check for this prompt is in production.
Check · Drag and Drop
Wire each clue to its mediator.
This self-scoring check is in production.
Evidence card 3
Add it to your evidence board
One gene, one protein, one pathway; the chart was writing it in plain sight — Chart Clue #22.
Scene 4 of 5
Reading the Whole Chart
What would have helped, in her words.
Slide · in production
Five Lines From the Last Entry
A name gives you words. It does not give you years.
Prefer the full lecture? Adaptive versus Innate Immunity (original video on the site)
Explore · in production
The rewrite desk, last time
Five chart sentences from five decades — “stomach bug” (11), “anxiety” (16), “perimenopause” (38), “negative” (42), “a little protein, recheck sometime” (49). For each, keep what was true, strike what was not, and add the one line that reads it against the rest of the chart; then match it to the diary’s five habits. Rank the five by years saved. Nothing recorded; a model rewrite appears after yours.
Think · not graded
Six clinicians heard “familial Mediterranean fever” from the patient and did not check. Two cited her ancestry; four knew too little to say anything. Which of those is the easier error to fix in a curriculum, which in a clinic — and what does “I don’t know, let’s find out” cost a doctor compared with what silence cost her?
The true/false spot-check for this prompt is in production.
Check · Essay
In 150 words: which single habit from the five would have caught the diagnosis earliest, and in what year?
This self-scoring check is in production.
Evidence card 4
Add it to your evidence board
Five habits, any one of which would have ended the case decades early.
Scene 5 of 5
The Study of One
No guideline, two uncertainties, one plan.
Slide · in production
Where the Case Stands
Relief is for people who got their time back. This is a plan.
Prefer the full lecture? Active–Passive Immunity (original video on the site)
Explore · in production
The next five years
A monitoring dashboard with five dials — flare frequency, CRP, SAA, urine protein, creatinine — and three branches: colchicine alone, colchicine plus anakinra, “took it only during attacks”. Predict each dial at one and five years for each branch before the model draws; then mark the single dial that decides whether to escalate. Last: write the one sentence you would want in her chart for the next clinician who meets her.
Think · not graded
There is no guideline for her genotype and there was no guideline needed for her phenotype. What does a clinician owe a patient who is a study of one — and what does the course owe the next student who meets a chart like hers and a panel that says “uncertain”?
The true/false spot-check for this prompt is in production.
Check · Summary
Choose the statement that survives scrutiny in each set.
This self-scoring check is in production.
Evidence card 5
Add it to your evidence board
No guideline, two uncertainties, a plan that protects the kidney — and a chart that was legible from page one.
4
Your evidence board
Every scene gave you an evidence card, and the chart adds more. Sort each card into the column it supports: One innate mechanism, organ by organ, Neither on its own, or Twenty-one unrelated problems. Some cards can honestly go in more than one place — that’s allowed, and the feedback tells you which cards decide the case.
Evidence board · drag and drop · in production
The sorting board for this chapter’s cards is being built. Until it arrives, sort your evidence cards on paper into the three columns above.
5
Your verdict
Time to decide. Look back at your bet, then build your verdict from statements that hold up — no writing needed.
Look back at your prediction
Twenty-one findings, eleven systems, forty-nine years — the most defensible reading is…
Find the one you chose at the top. Does the evidence support it, refute it, or revise it?
- Twenty-one unrelated problems in an unlucky patient — bodies accumulate diagnoses
- One innate mechanism — a loose brake, a ringing bell, a liverA large organ that produces bile, detoxifies blood, and stores nutrients. that answers — expressed organ by organ
- An autoimmune disease that was never properly tested for
Build your verdict · no writing
Choose the statement that holds in each set. The ones you keep become your argument.
This activity is in production.
6
The finding
Chart Clue #22 · logged
One Connected Story
One heterozygous MEFV variant of uncertain significance and one heterozygous LPIN2 variant; a pyrin brake that is loose in neutrophils and monocytes; IL-1β surges that drove forty-nine years of fever, serositis of three cavities, sterile synovitis, neutrophilic skin and cytokine-driven pain; IL-6 that reset bone, endocrine set points, vessels and reproduction; serum amyloid A stacked into AA amyloid in the gut wall and the glomeruli. Six negative ANAs, sterile cultures, reactive nodes, a working spleen: the innate arm firing without a target. FMF is autoinflammatory, not autoimmune, and on colchicine the SAA is falling and the proteinuria has stopped rising. Chart Clue #22: one gene, one protein, one pathway — in the chart from the first entry, named at fifty-one. This entry closes the diagnostic timeline the whole course has been assembling.
Next · Conclusion
Twenty-two clues, one mechanism
Lay the seven findings end to end, build the verdict that closes the course — autoimmune or autoinflammatory — and sit the next clinician down with a chart that says “negative” on page one.
Reliable information on rare diseases
NORD · NIH GARD · Orphanet · MedlinePlus Genetics: FMF · FMF & AID Global Association · Autoinflammatory Alliance · Global Genes · Amyloidosis Foundation
Stina has one rare disease. In the United States, about 1 in 10 people live with one of the more than 7,000 known rare diseases. These organizations are where patients, families and clinicians go for trustworthy information.
Hop to:
← Familial Mediterranean Fever — case home
All pages for Module 22 — The Immune System — Capstone
22.0 Module Overview
22.1 The Lab Result That Names Everything
22.2 Two Arms of Defense
22.3 The Cells and the Lymphatic Organs
22.4 The Inflammatory Response
22.5 Antibodies, Adaptive Immunity and Memory
22.6 From Pyrin to Amyloid
22.7 One Connected Story
22.8 Conclusion and Assessment
22.9 Evidence Behind the Case
All Modules
- Anatomical Language, Membranes & Homeostasis
- Just Enough Chemistry
- The Cell & Its Transport
- Making Cells & Proteins
- The Integumentary System
- The Skeletal System
- The Muscular System
- Nervous Tissue & the Senses
- The Spinal Cord
- The Brain & the Blood–Brain Barrier
- The Autonomic Nervous System
- Special Senses (in developmentThe process of growth and differentiation.)
- The Endocrine System
- Blood
- The Heart
- Blood Vessels
- The Digestive System
- The Respiratory System
- The Urinary System
- Fluids, Electrolytes & Acid–Base Balance
- The Reproductive System
- The Immune System
List of terms
- appendix
- bladder
- cortisol
- reproduction
- edema
- albumin
- organ systems
- anatomy
- physiology
- urine
- peritoneum
- pleura
- pericardium
- skin
- endocrine system
- uterus
- neutral
- memory
- serous membranes
- glomerulus
- liver
- development