The Side Effects of Vaccines - How High is the Risk?

  • Published: 12 May 2019
  • Sources:

    Vaccines are one of our best tools to prevent dangerous diseases, but they come with side effects. So would it be safer not to vaccinate?

    This video has been supported by a grant from the Bill & Melinda Gates Foundation.

    If you are interested how much sponsorships influence our videos, we wrote about that in detail here:

    Support us on Patreon so we can make more videos (and get cool stuff in return):


    The Voice of Kurzgesagt:
    Steve Taylor:

    The music of the video here:

    THANKS A LOT TO OUR LOVELY PATRONS FOR SUPPORTING US:Marsha Sohn, Henri Holler, Michelle, Dan Crowley, Alex Hackman, Sammy Mikhael, Marcus Thorén, Kevin Harris, Jayami, Andreas Poletti, David Coates, Omar Galvis, Denny Zavada, Don Knowlton, Sebastian, Jay Ruthnam, Shakira Graham, MatBu, Mikhail, Sinan Taifour, Knowledge Unlimited, Odilia Krause, Anri Digholm, Dominykas, James Gaglio, Alice Jones, Narciso Jaramillo, Qaalid Hashi, Nate Bender, Gulyás Gergely, Michael Bloch, Rick Merced, Etienne Huguenot, Jonathan Lopez, Kai Smith, Benjamin Arndt, Philip Potvin, Amy Halter, Dylan polin, Zach Evans, Karan Chawla, Michael Casey, Francis Bouchard, William Gu, peck neck, Dien Buwono, Patrick Pruitt, Alexander Isayenko, Connor Doherty, Kierr Suñega, Kongpak Phupa, Lewis Foret, Daniel Ingegneri, David Saitta, Soeren Pollerhof, Ravi Shankar, Nico Kooyman, Anna Liceva, Dan Long, ADAM M., Cruz Godar, Pedro Caetano, Jean-Pierre Girard, Jonathan Piedrasanta, Jak SP, Jim Renney, Danielle Mitchell, Giorgio Valli, Ben Evans, Bill Cohen, Gitle Mikkelsen, Gemini00, Benjamin Mahoney, Christopher DiBattista, Mandy Reid, Gary Reckard, Sataporn Chaochonpun, Bigolf, Moses Malone, Kyle Merryman, Dante Bencivenga, Zeus Laser, Jake Wise, Jade, Fontaine Liu, Manav parmar, ethnicolor

    Help us caption & translate this video!

Comments • 75 645

  • Kurzgesagt – In a Nutshell

    Dive into sources and further reading here:

    Vaccines and their side effects are a hard topic to cover – we know we keep saying this, but this case especially, there were a lot of things to consider. You can’t blame people for being worried, so we wanted to take their concerns seriously.

    Because it is impossible to cover everything there is to know about vaccines in a ten minute video our sources are extra extensive and explain a lot of aspects in more detail, with an extra focus on further reading.

    So if you want to dive in deeper or have more arguments at hand for your next heated discussion, here you go.

    • A random Weeb
      A random Weeb  4 days back

      500 comments boiiiiiiiiiiiiiiiiii.

    • strange times
      strange times  3 weeks back

      HAHAHA, Google's largest shareholders are PHARMA companies and your ONLY source of data is Google? HAHAHAHAHAHAHAHAHAHA!!!!

    • luigios11 mario
      luigios11 mario  3 weeks back

      i have a feeling that every single anti vax will freak out as soon as you say there's a catch

    • Get Pugger
      Get Pugger  1 months back

      Clint Ofray did your brain kill itself because it knew you were no hope

  • SLHP productions
    SLHP productions  56 minutes back

    Preaching to the choir....

    • Viktor von DOOM
      Viktor von DOOM  2 hours back

      Memory cells AKA memberberries

      • busygalaxy YT
        busygalaxy YT  3 hours back

        Love him or hate him,
        His spitting straight facts about vax

        • Bloxy Red
          Bloxy Red  4 hours back

          3:14 i imagined it like this:
          Cell1: Yo did you see that game yesterday?
          Cell2: Yeah it's co-
          *vaccine bacteria flies around playing Solder of dance*
          Cell1: Oh no- *HRRRRRRR*

          • Seyyed Mohammad Ahmadi
            Seyyed Mohammad Ahmadi  6 hours back

            At 4:56 there's the SHIELD helicarrier and Stark Tower

            • Romanu Fainosag
              Romanu Fainosag  9 hours back

              This is the great filter...convincing dumb people vaccines save lives

              • Nicky Boi
                Nicky Boi  9 hours back

                Where are the balls

                • Not Just Another Homestuck

                  Vaccines do not cause autism.

                  *H A H*

                  • Rochelle Villafuerte
                    Rochelle Villafuerte  10 hours back

                    Anti-vax people probably will feel dumb after this vid

                    • Jesus Christ
                      Jesus Christ  3 hours back

                      No. They will still think they're right because Karen on facebook told them!

                  • TheBegottenWarrior
                    TheBegottenWarrior  10 hours back

                    Anti-Vaxxers are the stupidest people ever.

                    • TheMinecraftSquid - Minecraft, ROBLOX Y Mas

                      i got vaccinated as a kid
                      i wanted to skip it but I got vaccinated

                      • Michu mochi
                        Michu mochi  13 hours back

                        Karen’s must be dumbfounded and confused

                        • Diego Fernández
                          Diego Fernández  15 hours back

                          Antivaxxer 40 year old soccer mom: *Sees the title*
                          Antivaxxer 40 year old soccer mom: I KNEW IT *scrolls away*

                          • Sunita Lekkala
                            Sunita Lekkala  15 hours back

                            In the vaccine effect part you didn’t say how many kids would contract measles

                            • Vary Olla
                              Vary Olla  4 hours back

                              Your post makes no sense.  You might want to rethink your question.  Have a nice day.

                          • dFuZe_ SynlyLeo
                            dFuZe_ SynlyLeo  16 hours back

                            B R E A T H I N G. C A U S E S. A U T I S M.

                            • dFuZe_ SynlyLeo
                              dFuZe_ SynlyLeo  16 hours back

                              I needed more then 20 shots of vac’s because PRIVATE reasons, and I’m not dead lol

                              • Rainbow Shrimp
                                Rainbow Shrimp  8 hours back

                                dFuZe_ SynlyLeo *I needed to get extra vaccines that I already had to live in the US, so that was cool*

                            • Omega Echo
                              Omega Echo  16 hours back

                              KAREN WOULD LIKE TO SPEAK TO YOUR MANAGER

                              • Funpuns 08
                                Funpuns 08  18 hours back

                                Kid: I wanna live for atleast 70

                                Anti- Vaccine Mom: I’m about to end this man’s whole career

                                • Sanic The Hotdog
                                  Sanic The Hotdog  22 hours back

                                  Dangerous diarrhea

                                  • TigerRod
                                    TigerRod  22 hours back

                                    You forgot the most serious side effect of vaccines. And YES. This is confirmed by studies. Vaccines DO increase the risk of this effect.

                                    It's called overpopulation, and it's only gotten worse since humans started developing vaccines.

                                    • eeeaten
                                      eeeaten  3 hours back

                                      TigerRod doesn’t actually work that way.

                                    • Malcolm Lynas
                                      Malcolm Lynas  17 hours back

                                      solution: let natural selection kill off the anti-vaxxers. population decreases, retarded people are gone. it’s a win-win

                                  • Elijah Ho
                                    Elijah Ho  23 hours back

                                    Memory Cell: Knows how to fight previous infections
                                    Also Memory Cell: Is old and has Vietnam level flashbacks and PTSD

                                    • memey s
                                      memey s  1 days back

                                      Anti vaxxers were vaccinated cause they are past three but their brains have not grown

                                      • equintix
                                        equintix  1 days back

                                        Damn bro my cells are pretty cool, thats why i feed them chewed up food covered in saliva

                                        • Jeremy Smith
                                          Jeremy Smith  1 days back

                                          Bill Maher should watch this

                                          • FBI Agent
                                            FBI Agent  1 days back

                                            The side effects of vaccines are adulthood.

                                            • Happy Gamer
                                              Happy Gamer  1 days back

                                              8.1k anti vaxxers disliked

                                              • Cicidra Lisa
                                                Cicidra Lisa  1 days back

                                                I was born in 2011

                                              • Moo cruize
                                                Moo cruize  1 days back

                                                Ok so we found out that we have around 8 thousand anti vaxxers who watched this because we have about 8 thousand dislikes

                                                • Saktiawan See
                                                  Saktiawan See  1 days back

                                                  To Kurgezast. Please made video about 'auto immune disease' 🙏🙏😊

                                                • Its Fox
                                                  Its Fox  2 days back

                                                  I would never vaccinate my kids. It is reckless, harmful, and dangerous.
                                                  I take my kids to the doctor so they can vaccinate them instead.

                                                  • Luke Allen
                                                    Luke Allen  22 hours back

                                                    Its Fox they had us in the first half, I’m not gonna lie

                                                • McBobbish
                                                  McBobbish  2 days back

                                                  Even if vaccines *did* cause autism? Still be fucking worth it.

                                                  • Krom Shom
                                                    Krom Shom  2 days back

                                                    s u r v i v a l

                                                    • The Bears
                                                      The Bears  2 days back

                                                      Actually 100% of vaccinated people die

                                                    • ConeGaming+
                                                      ConeGaming+  2 days back

                                                      Not being vaccinated is like starting life on hard mode.

                                                      • Random Animations
                                                        Random Animations  20 hours back

                                                        ConeGaming+ sorry
                                                        Your free life subscription is over

                                                    • Zelma Gaming
                                                      Zelma Gaming  2 days back

                                                      Natural selection. People raised to not use vaccines and aren’t vaccinated die and the people that aren’t brain-dead live.

                                                      • Elim Kwok
                                                        Elim Kwok  2 days back

                                                        Vaccines made me dead inside

                                                        • Elim Kwok
                                                          Elim Kwok  1 days back

                                                          @Francis I'm supposed to be just dead, but now I'm only dead inside

                                                        • Hi how are you
                                                          Hi how are you  2 days back

                                                          Dead inside alive outside

                                                        • Francis
                                                          Francis  2 days back


                                                      • ACringyReference
                                                        ACringyReference  2 days back

                                                        What kind of war zone is this comment section...?

                                                        • Vary Olla
                                                          Vary Olla  1 days back

                                                          If you refer to the video = look below it.  Science-oriented channels place sources and links in the drop-down menu below their videos.

                                                        • ACringyReference
                                                          ACringyReference  2 days back

                                                          I still want to see the sources of this people, just for shit and giggles you know?

                                                        • Vary Olla
                                                          Vary Olla  2 days back

                                                          Not much of one really.  lol!  When all we see are anti-vaccine proponents all parroting what amounts to the same pseudo-scientific and conspiracy theory claims they got from their "friends" in the echo chambers they create for themselves on social media then it requires little effort to expose and debunk such claims.  It is the intellectual equivalent of placating a restless child via some diversion = little brainpower involved.  Have a nice day.

                                                      • purple lights
                                                        purple lights  2 days back

                                                        My sis ha autisim

                                                      • Wszechświat
                                                        Wszechświat  2 days back

                                                        i'm glad my mom is pro-vaxx

                                                      • The bAcoOn K1nG
                                                        The bAcoOn K1nG  2 days back

                                                        What happens if we just injected memory cells of the disease from health people?

                                                        • Vary Olla
                                                          Vary Olla  2 days back

                                                          To add to what others have noted I would also point out the expense involved.  It would be considerably more expensive to either obtain such cells via blood draws and/or grow in a laboratory actual cells to administer to someone.  Meanwhile cells such as with when someone receives blood products etc. are usually given IV = even more invasive than a shot. 

                                                          So it is cheaper and easier to simply grow bacteria and viruses and separate out the parts we need or else to attenuate them for use in vaccines.  Huge amounts can easily be grown in some medium after which the parts we need are simply separated out and there is little fear of rejection.  Have a nice day.

                                                        • America January
                                                          America January  2 days back

                                                          They are genetically incompatible

                                                        • Corey Playz
                                                          Corey Playz  2 days back

                                                          Also, blood types,

                                                        • jonny abreu
                                                          jonny abreu  2 days back

                                                          I asume that Since they are not memory cells that our body created , our body would think those cells are viruses/bacterias and just try to kill then

                                                      • Bonyfax 234
                                                        Bonyfax 234  2 days back

                                                        One word:

                                                        • Star Silver
                                                          Star Silver  2 days back


                                                          Facts don’t care about your feelings

                                                          • Enayat Choudhury
                                                            Enayat Choudhury  2 days back

                                                            The most adorable animated kids I've ever seen. That scene with the child with encephalitis disturbed me...

                                                            • Jassem Salim
                                                              Jassem Salim  2 days back

                                                              So. The problem with vaccines is they are so good it makes overpopulation?

                                                              • Rajat Jadhav
                                                                Rajat Jadhav  2 days back

                                                                1:51 the memory cell gets PTSD

                                                                • uzielperez2002
                                                                  uzielperez2002  2 days back

                                                                  I wish my mom was antivaxx bc I wanna d i e

                                                                • Wut Wut
                                                                  Wut Wut  2 days back

                                                                  เลิกไหว้พระ เลิกทำบุญเอาตังซื้อสมาร์ทโหนขยายคว่ามรู้ดีกว่า

                                                                  • The Shinto Railfan
                                                                    The Shinto Railfan  3 hours back

                                                                    English: How is this related to video?

                                                                  • The Shinto Railfan
                                                                    The Shinto Railfan  3 hours back

                                                                    Sorry, @Level 100 Of Stupidity, but I don't have any other way of translating it.

                                                                  • Level 100 Of Stupidity
                                                                    Level 100 Of Stupidity  3 hours back

                                                                    @The Shinto Railfan Google Translate is not reliable, he is speaking Thai which is my first language, the main comment said to stop praying to gods and use money to buy smartphones to spread/expand knowledge.

                                                                  • The Shinto Railfan
                                                                    The Shinto Railfan  2 days back

                                                                    เอ่อ ... โอเค? ฉันไม่รู้ว่าจะทำอย่างไรกับวิดีโอ แต่ตกลง
                                                                    English: Uhhh... OK? I have no idea what that has anything to do with the video, but OK.

                                                                  • The Shinto Railfan
                                                                    The Shinto Railfan  2 days back

                                                                    You said: Stop paying respect to gods, make merit, buy smart nodes, expand knowledge and know better