# Immunology, Start to Finish, in 5 Days

> The whole immunology system for Step 1 in 5 days: the 28 immunology organisms and the defect that lets each one in, then active reading of First Aid pp. 94–119 on the First Aid Guide, Mehlman for active application, FA Foundation Anki for active recall, and UWorld with the RPSR method.

URL: https://drmarishasudani.com/immuno-5-days
Canonical: https://drmarishasudani.com/immuno-5-days

## Questions this guide answers

- **How do I study immunology for Step 1 in 5 days?** Micro first. Day 1: the 28 immunology organisms, each learnt with the immune defect that lets it in. Day 2 to the middle of Day 3: active reading of First Aid pp. 94–119 on the First Aid Guide, with the MCQs on every page. Middle of Day 3 to the middle of Day 4: the Mehlman Medical immunology playlist. Second half of Day 4: the FA Foundation Anki immunology cards. Day 5: UWorld immunology in 20-question tutor blocks with the RPSR method.

## Page text

USMLE Vault · Step 1 · Immunology
Immunology, Start to Finish, in 5 Days
26 First Aid pages · 28 organisms · 136 page MCQs · 5 days . The chapter that feels abstract, made concrete.
By Dr. Marish Asudani · Published 22 October 2026
How do I study immunology for Step 1 in 5 days?
Micro first: the 28 immunology organisms, each with the defect that lets it in . Then active reading of First Aid pp. 94–119 on the First Aid Guide with the MCQs on every page, then the Mehlman Medical immunology playlist, then the FA Foundation Anki immunology cards, then UWorld immunology on Day 5 with the RPSR method.
Read this first. This plan is only for you if you have roughly 10–12 hours a day for studying, and you're either an intern or a graduate. Working, with 5–8 hours a day? Keep the same order and stretch the days: Step 1 while working →
Immunology feels abstract. Cytokines, CD markers, complement, 10 kinds of immunodeficiency, and none of it feels like a patient. So people read it 3 times and still can't answer a question on it.
Here's what changes it. Every immunology question is really 2 questions: which defect does this patient have , and which bug got in because of it . That's why micro comes first in immunology . Once you know the bugs by their defect, the chapter has something to hang on.
After the micro, it's the method I use for every system: how to study any system → Immuno is doable in 5 days.
Students who did this
Real students, in their own words, on the exact tools in this guide. Tap to play.
Ananya · Passed Step 1 An honest review of Vault Anki
Ashna · Passed Step 1 An honest review of Vault Anki
Try a free 3-day trial → usmlevault.com · no card needed
▶ How to Do the Immuno System 15 minutes. Watch it once, before Day 1. It's the same video the Vault schedule gives you on day 1 of immuno.
Start here · before page 1
Immunology: micro and pharm first
Immunology starts with its own organisms: 28 organisms , each with the defect that lets it in. Immunology has no Pharm pill; its drugs, the immunosuppressants, are pp. 118–119, read on Day 3. These are the full guides.
Microbiology
Immunology micro: the 28 organisms → Every organism paired with its defect, with the WRWRT method worked on 1
Microbiology by system → Why micro is 9 short lists, 1 per system, and how to run each one
Sketchy Micro in 6 days → The WRWRT method in full, if these organisms are new to you
Pharmacology
The High-Yield Pharmacology PDF → Look for any immunology drugs before you read. Free
Pharmacology in 48 hours → The FWRT method and the whole drug map, system by system
All of antibiotics in 90 minutes → The drugs for the organisms on this list: 1 video, then the cards
The NBME Booster pharmacology deck → Every NBME pharmacology question as flashcards, for your final week
Open Immunology in the First Aid Guide → The Micro and Pharm pills are at the top of the system in the First Aid Guide. Free for your first 3 days.
Where this system sits
The order: easy systems first, cardio last
Immunology is the 6th system, after endocrine and right before heme-onc (immunology → heme-onc is a fixed order). Cardio comes last. Tap a system to open its guide.
1 Renal 6 days · the easy one, start here Open →
2 Respiratory 6 days · same method as renal Open →
Before it: Biochem nutrition, 1 day, right before GI · where it sits
3 GI 7 days Open →
4 Reproductive 7 days Open →
Before it: Biochem carb and lipid metabolism, 1 day, right before endo · where it sits
5 Endocrine 6 days Open →
6 Immunology You are here 5 days Open →
Before it: Biochem cellular, molecular and amino acids, right before heme-onc · where it sits
7 Heme-onc 6 days Open →
8 MSK 6 days, no derm Open →
Before it: Dermatology, 3 days, after MSK · the derm block
9 Psychiatry 5 days Open →
Before it: Genetics and ANS, right before neuro · genetics
10 Neurology 7 days Open →
11 Cardiovascular 7 days · always last Open →
Biochem is never a block of its own: each piece sits right before the system that needs it. The whole method, once: how to study any system →
Immunology in 5 days, hour by hour
Clock times assume an 11-hour day: 9 AM–1 PM, 2–6 PM and 7–10 PM, with lunch and dinner in the gaps. Shift the clock to your day. Keep the order.
Day 1 · Micro first 28 organisms, each with its defect
9–9:15 AM Watch How to Do the Immuno System , the University walkthrough.
9:15 AM–1 PM Micro: the antibody-defect and asplenia organisms, then the complement ones, WRWRT. Say the defect out loud with every organism.
2–6 PM Micro: the phagocyte-defect, T-cell-defect and IgA-deficiency organisms, the same way.
7–9 PM Test: the First Aid Guide MCQs for all 28 organisms. Any miss → that organism and its defect again.
Day 2 · Active reading First Aid Guide, page by page, MCQs on every page
9 AM–1 PM pp. 94–101 · lymphoid structures, spleen and thymus, innate vs adaptive, MHC I and II, NK cells, T- and B-cell activation
2–6 PM pp. 102–108 · antibody structure, isotypes, complement, cytokines, respiratory burst, cell surface markers
7–10 PM pp. 109–112 · vaccination, hypersensitivity types I–IV, transfusion reactions
Day 3 · Reading, then Mehlman
9 AM–1 PM pp. 113–119 · autoantibodies, the immunodeficiencies, infections in immunodeficiency, transplant rejection, immunosuppressants
2–6 PM Watch How to watch Mehlman Medical videos (10 minutes), then the Mehlman immunology playlist from the top, in order.
7–10 PM Mehlman, continued. Pause before he answers and answer it yourself.
Day 4 · Mehlman, then Anki
9 AM–1 PM Finish the Mehlman immunology playlist. Any gap → that First Aid Guide page, the same day.
2–6 PM FA Foundation Anki · Immunology , all 113 cards. Answer before you flip.
7–9 PM Open the First Aid page of every card you hesitated on. Read the line and a couple above and below.
Day 5 · UWorld immunology + the finish check Unused · immune system only · tutor mode · 20 questions a block
9–9:30 AM Clear today's due FA Foundation Anki cards first.
9:30 AM–1 PM Blocks 1–2 (Qs 1–40): solve both in tutor mode, log each score, then review every bookmark in First Aid.
2–6 PM Blocks 3–4 (Qs 41–80): solve both in tutor mode, log each score, then review every bookmark in First Aid.
7–10 PM Blocks 5–6 (Qs 81–120): solve both in tutor mode, log each score, then review every bookmark in First Aid.
Want a day-by-day schedule that tells you exactly what to study next? The Vault builds it around your exam date.
Build my schedule →
Day 1
Micro first: 28 organisms, each with its defect
Open the First Aid Guide → Immunology in the Vault ( what the First Aid Guide is ) → the Micro pill. Every other system's micro list answers "which bug infects this organ". This one answers "which bug gets in when this defect exists" . Learn every organism as a pair with its defect, or you've learnt half of it.
Open Immunology in the First Aid Guide First Aid pp. 94–119, page by page: Focus On, ELI5 and the MCQs on every page. Opens straight into immunology.
Open Immunology →
🦠
Micro · 28 organisms · the WRWRT method. W atch at 1x, no notes → R ecall the story in order, and say the defect out loud with it → W atch again only the gaps at 1.5–1.75x → R ead the Sketchy PDF → T est with the First Aid Guide MCQs for those organisms.
Antibody defects, asplenia: the encapsulated bugs: S. pneumoniae , H. influenzae type B, N. meningitidis , Klebsiella , Group B strep, Salmonella , Pseudomonas . Enteroviruses in Bruton's.
Complement C5–C9: N. meningitidis (recurrent), N. gonorrhoeae (disseminated).
Phagocyte defects (CGD, LAD, Chédiak-Higashi): catalase-positives: S. aureus , Burkholderia cepacia , Serratia , Nocardia , Aspergillus , invasive Candida .
T-cell defects (DiGeorge, SCID, HIV): MAC, CMV, EBV, VZV, HSV, JC virus, Toxoplasma , Cryptosporidium , mucocutaneous Candida , Pneumocystis , Cryptococcus .
IgA deficiency: Giardia .
Open Immunology Micro (all 28, numbered) →
▶ How to Do Sketchy Micro The WRWRT method on video.
▶ Dirty Medicine · Microbiology Backup only: 1 video for an organism that still won't stick after the Sketchy PDF.
The overlaps are on purpose. N. meningitidis sits under antibody defects and complement defects. Candida is mucocutaneous with T-cell defects and invasive with CGD. Same organism, different reason, and the reason is what the question turns on.
Immunology has no pharm list on the map. The immunosuppressants (pp. 118–119) are read on Day 3 like any other page.
Before Day 2: what the First Aid Guide is
First Aid was written to remind , not to teach . The First Aid Guide gives every page a Focus On , a Concept Walkthrough , an ELI5 for each heading, How is this tested? , and the Test Yourself MCQs on that exact page. It also tells you what to skip. Page 94, lymphoid structures, opens with this study note:
Study note, p. 94: "Not much important other than paracortex."
That 1 line saves you an hour. See every block on a real page →
First Aid p. 114 (B-cell immunodeficiencies) in the First Aid Guide: Focus On, the ELI5s, the video guide, Concept walkthrough, Key takeaways, How is this tested? and Test yourself.
Day 2 → first half of Day 3
Active reading: First Aid pp. 94–119
1
Focus On → 2. Concept Walkthrough and ELI5s , explained out loud → 3. the actual First Aid page → 4. the Test Yourself MCQs . Any miss → back to that heading before you turn the page.
Pace: 10–12 minutes a page . 19 pages on Day 2, 7 on the morning of Day 3. Understand, don't memorise.
Day 2 · pp. 94–112 (19 pages)
Pages Topic
94–96 Lymphoid structures, lymphatic drainage, spleen and thymus
97–101 Innate vs adaptive, MHC I and II, NK cells, T-cell differentiation, T and B cell activation
102–106 Antibody structure, immunoglobulin isotypes, complement, cytokines
107–108 Respiratory burst and phagocytes, cell surface proteins and markers
109–112 Vaccination, hypersensitivity types I–IV, transfusion reactions
Day 3, first half · pp. 113–119 (7 pages)
Pages Topic
113–116 Autoantibodies, B-cell, T-cell and combined immunodeficiencies, phagocyte dysfunction, infections in immunodeficiency
117–119 Transplant rejection, immunosuppressants
🎬
A page still won't click? The videos on the First Aid Guide page come first. Then 1 backup, for that topic only:
▶ Dirty Medicine · Immunology Backup only. 1 video for 1 topic.
Day 3, second half → Day 4, first half
Active application: Mehlman Medical
For immunology, Mehlman is very good. Honestly amazing. He takes the immunodeficiency and hypersensitivity questions that all look alike and shows you the 1 clue that rules an answer in and the clue that rules it out.
1
Videos, not PDFs. The full immunology playlist, in order. Watch the walkthrough in the University section first.
2
Pause before he answers. Answer it yourself. Any gap → that First Aid Guide page, the same day.
▶ Mehlman Medical · Immunology playlist Your active application step. In order, about 1 day.
Why: active application turns facts into decisions . How to use Mehlman →
Day 4, second half
Active recall: FA Foundation Anki, Immunology
The FA Foundation Anki immunology deck is 113 cards (as of October 2026) , First Aid page by page, with the page number on every card . Answer before you flip. Hesitate → open that page, read the line and a couple above and below.
A FA Foundation Anki card (renal shown), flipped: First Aid p. 597 on the card, and “Study this in First Aid” under the answer. The immunology deck works the same way.
Why: the first pass of immuno without the page in front of you . How to run the decks → · Open FA Foundation Anki in the Vault →
Run the FA Foundation Anki · Immunology deck 113 cards (as of October 2026), First Aid page by page, with the page number on every card. Opens straight into the deck.
Open the deck →
Day 5
UWorld immunology: the RPSR method
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## Source

USMLE Vault — https://usmlevault.com
Author: Dr. Marish Asudani

Updated: 2026-10-22