Book · 2021
Immune: A Journey into the Mysterious System That Keeps You Alive
by Philipp Dettmer
Philipp Dettmer of Kurzgesagt turns the immune system into a 300-page illustrated war story, written for the person who watched every YouTube video and still wanted more.
What does Reddit think of Immune: A Journey into the Mysterious System That Keeps You Alive?
All 8 mentions of Immune on Reddit live in r/askscience, and that's the tell. Nobody is recommending it in r/books or r/suggestmeabook; it surfaces specifically when someone asks about measles, vaccines, cancer cells, or why the immune system does a particular thing. That context shapes what Reddit actually says about it: commenters reach for Immune the way they reach for a Kurzgesagt video — as a bridge between "I'm curious" and "I now understand the mechanism." The ↑45 comment links it alongside the Kurzgesagt YouTube channel as a natural companion; the ↑15 and ↑6 posts recommend it unprompted in threads about immune education. The sentiment scores are neutral across the board, which here means informational rather than contested — nobody shows up to argue the book is wrong or overrated. Eight unique commenters across 2019 to 2025 is a thin sample, but the pattern is consistent: r/askscience regulars treat it as the illustrated explainer that holds up when the videos end.
Community feedback & reader fit
Themes
- · Immune system mechanics explained through analogy and illustration
- · Kurzgesagt visual style translated to long-form writing
- · Science communication pitched at curious non-specialists
- · Vaccines, cancer defense, and pathogen response as narrative arcs
Common praise
- + r/askscience commenters recommend it in the same breath as Kurzgesagt's own videos, treating the book as the natural next step after the channel.
- + The cancer-defense chapter gets cited directly — one commenter uses it to explain why the body quietly kills cancer cells every few minutes.
- + Readers link it as the answer to "I want to go deeper" without suggesting any other book competes for that slot.
Common criticism
- − With only 8 Reddit mentions over 7 years, all in one subreddit, there's no cross-community conversation to draw from — the book hasn't broken out of its niche.
- − None of the quotes engage with the writing at the sentence level; people recommend the information, not the prose.
- − No dissenting takes exist in the data, which could mean universal approval or simply that nobody finds it worth arguing about.
Who it's for
You've watched the Kurzgesagt immune system series twice and you're still not done with the topic. That's the reader r/askscience commenters are writing to when they drop this link. If your kid is obsessed with how the body fights infection, the ↑45 comment makes the case directly. If you want the vaccine mechanism explained with actual molecular detail rather than a metaphor that stops short, this is what the ↑6 posters are pointing at. Skip it if you need peer-reviewed depth — this is illustrated science communication, not a textbook. But for the gap between YouTube and a university course, nothing else gets recommended in its place.
Mentions over time
Top subreddits
Which Reddit comments matter for Immune: A Journey into the Mysterious System That Keeps You Alive?
Top-upvoted quotes across the subreddits where this book is mentioned. Click through to read the full thread.
“Have you read Kurzgesagt's Book on the immune system?. I assume you've heard of it and his channel if your kiddo is super into the immune system, but I figured I'd mention it in the off chance you weren't a…
“There is a whole video of how Measles affects the body and immune system on a site called KURZGESAGT - I highly recommend it!! Link for the lazy: WARNING: This site is full of nerd-tastic videos on all sorts of topics. You may start watching at 1:08pm, get su…
“Kurzgesagt did a great video and follow up book about the immune system if anyone's interested. I highly recommend it: The…
“The simplest explanation is using the old adage: Give a person a fish, they will eat for a day. Teach them to fish, they will never go hungry. The antibodies are consumables, and they expire. If you give the body the means to *produce its own antibodies*, it will be ready when/if the threat appear…
“The classic "The Inner Life of a Cell" ( and narrated - ) is about that process that changes a WBC from "rolling along" to stoping and then changing form and all the molecular mechanisms that activate to do this. Kurzgesagt also has a video on…
“Several reasons: 1. We are NOT bad at fighting cancer. Kurzgesagt wrote a book about the immune system and made several videos about it. According to them, your body quietly kills a cancer cell every few minutes. Your cells have protection mechanisms against cancer cells but every so often one gets…
“I do love the level of information in these responses. [There is a great book by Kurzgesagt In a Nut Shell about immunity.](
“I really recommend the book Immune by Philipp Dettmer of Kurzgesagt if you want to learn more about how this all works!
Convinced? Pick up Immune: A Journey into the Mysterious System That Keeps You Alive
What else does r/askscience read?
Other books mentioned in the same sub, ranked. Shared-sub overlap with this title breaks ties.
The Selfish Gene
Richard Dawkins
Richard Dawkins argues that evolution makes more sense when you stop rooting for the organism and start watching the gene.
The Emperor of All Maladies: A Biography of Cancer
Siddhartha Mukherjee
Siddhartha Mukherjee traces cancer from ancient papyrus to targeted therapy, framing it as a 4,000-year war medicine is still losing on some fronts.
What If?: Serious Scientific Answers to Absurd Hypothetical Questions
Randall Munroe
Randall Munroe takes absurd physics questions — what if a baseball traveled at 90% the speed of light? — and answers them with actual math.
Your Inner Fish: A Journey into the 3.5-Billion-Year History of the Human Body
Neil Shubin
A paleontologist finds a fish fossil in the Arctic and uses it to trace the evolutionary origin of your hands, ears, and hernias.
A Brief History of Time
Stephen Hawking
Stephen Hawking explains black holes, the Big Bang, and the edge of time to people who never took a physics class.
Cosmos
Carl Sagan
Carl Sagan's 1980 tour of 15 billion years of cosmic history, written for anyone who once looked up and wanted a real answer.
Immune: A Journey into the Mysterious System That Keeps You Alive — frequently asked
What does Reddit actually say about Immune by Philipp Dettmer?+
Broadly positive, though the sample is small. All 8 mentions come from r/askscience, where commenters recommend it when immune-system questions come up in threads about vaccines, measles, or cancer. Nobody argues against it. The neutral sentiment scores reflect informational rather than contested discussion — it's not a culture-war book, it's an explainer people reach for when a YouTube link isn't enough.
Is Immune worth reading if I've already watched all the Kurzgesagt immune system videos?+
Yes, and that's exactly who recommends it. The ↑45 comment in r/askscience links the book alongside the Kurzgesagt channel specifically for readers who are already into the topic. The book covers the same visual logic but with room to go further — commenters cite it for mechanistic detail (how vaccines generate antibody production, how the body clears cancer cells) that a 10-minute video can't hold.
Is Immune by Kurzgesagt good for kids interested in science?+
Depends on the kid. The ↑45 r/askscience comment raises it explicitly for a parent whose child is "super into the immune system," so there's precedent for younger readers. The illustrated format helps. That said, the book doesn't get recommended as a children's book — it's pitched at adults who want real mechanism, not a simplified overview. A curious 12-year-old could handle it; a bored one would not.
How many times does Immune come up on Reddit, and does it have competition?+
Eight mentions over seven years, all in r/askscience. No competing immune-system book gets named alongside it in any of those threads. The ↑15 and ↑6 comments recommend it unprompted, without hedging against an alternative. That's not a crowded recommendation space — it's the only book commenters reach for when the topic comes up.