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

  • Published: 12 May 2019
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    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?

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Comments • 75 943

  • 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.

    • Jordan Sutche
      Jordan Sutche  2 days back

      The fact you brought up Wakefield's "research" just proved you didn't actually look into it at all. That's a fact.

    • Haziq Aiman
      Haziq Aiman  2 days back

      Ok gus

    • A random Weeb
      A random Weeb  1 weeks 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!!!!

  • Trần Thị Minh Châu Đàm

    Memory cells: *Sees Flu virus*

    Memory cells: *Has Vietnam Flashback*


    • אמנון נחשלים

      I am glad that we have David Icke for unadulterated information.
      Herd immunity=herd ignorance☹

      • Xx RangoNLevi06 xX
        Xx RangoNLevi06 xX  5 hours back

        Wait, if u beat cancer does that mean u can’t get it again?

        • Vary Olla
          Vary Olla  1 hours back

          Partially correct Ashley.  You are correct in that cancer represents an idiopathic aberration with your cellular makeup rather than an external pathogen as with infectious diseases.  Yet your body periodically produces aberrant cells as a normal byproduct of the cellular mitosis which drives our bodies.

          Your immune system will usually identify these defective cells and instruct them to commit "suicide" via apoptosis.  When that system breaks down however = we see tumors and cancer result.  So cancer represents a dysfunctional immune system and accordingly there is nothing to "learn".  All we can do is to try to destroy those aberrant cells externally via things like chemo or radiation and hope the immune system will kick in to do the rest. 

          Moral of the story:  because it failed to do it's job to begin with = it can similarly fail again.  That is why we sometimes see reoccurrence after a time or else cancers affecting other systems.   Something is amiss with the body which it can not overcome = making it subjective to the individual alone.  We can prevent measles because it's cause is a single known virus.  Cancers on the other hand can be the result of multiple etiologies making them difficult to pin down.  Have a nice day.

        • Ashley Gardner
          Ashley Gardner  2 hours back

          Cancer is a little different. Cancer is a mutation from cells already inside your body so its nothing you contract. Your body may learn from previous cancer, but cancer cells are much harder to destroy

      • Roy the big gey is not go no more gey

        Births cause autism

        • Lea Tompkins
          Lea Tompkins  6 hours back

          To many antivaxxers dont realize how bad these diseases are. I've herd stories from my grandmother about kids with polio when she was young, and how scary it was you could be next in the hospital with an iron lung.

          • Trần Thị Minh Châu Đàm

            Me, a coffin seller: *Sees an anti-vaxxer*

            Me: *STONKS* 📈

            • Nate Da Grate
              Nate Da Grate  8 hours back

              I sorta am half in half out. I've been vaccinated but at the same time I havent been vaccinated in everything. Now please don't kill me, but I do believe that some vaccines are lethal and unnecessary. But vaccines that are necessary obviously are needed. So yea if u wanna get vaccinated just think if it's unnecessary or not

              • Danimeme
                Danimeme  9 hours back

                Kurzgesagt puts its foot don at the end

                • Aji Pangestu
                  Aji Pangestu  9 hours back

                  Come on leave the antivaxxers alone, they are very valuable to develop new deadly disease so we can reduce our number

                  • 6969 subscribers with 0 videos challenge

                    harmful bacteria: **enters the second time**
                    also harmful bacteria: "why do i hear boss music?"

                    • 6969 subscribers with 0 videos challenge

                      8k dislikes are from anti vaxxers

                      • Playeryboi
                        Playeryboi  11 hours back

                        If you get sick over the weak cousin of measles then you’d probably die with the real measles parasite

                        • Rubicon AU
                          Rubicon AU  12 hours back

                          Honestly if I had money I would be buying so much merchandise and using Patreon.

                          • Rubicon AU
                            Rubicon AU  12 hours back

                            At 7:38 all 8k Anti-vaccinators disliked. They got proven wrong by probably the *BEST* Channel of its type (my opinion).

                            • Ethan Stankowski
                              Ethan Stankowski  12 hours back

                              Did anti-vaxers (in America)
                              Fail history class

                            • Irwan Nirwana
                              Irwan Nirwana  13 hours back

                              Did u from u.s.a?

                              • as
                                as  14 hours back

                                Fake video. Vaccines cause more deaths than measles worldwide

                                • Chris Heil
                                  Chris Heil  5 hours back

                                  Show me them sources like this video did bud....

                                • Danimeme
                                  Danimeme  9 hours back

                                  Oh silly but vaccines prevent measles deaths

                                • MLGBANANABUS
                                  MLGBANANABUS  9 hours back

                                  Who do you think

                                • Playeryboi
                                  Playeryboi  10 hours back

                                  MLGBANANABUS me or as

                                • MLGBANANABUS
                                  MLGBANANABUS  10 hours back

                                  You are littering this beautiful world by living

                              • Remer Mequiota
                                Remer Mequiota  14 hours back

                                dat end music tho

                                • Remer Mequiota
                                  Remer Mequiota  14 hours back

                                  dont forget about dengue vaccines here in the phillipines

                                  • ryahmib
                                    ryahmib  14 hours back

                                    4:55 why your scenario take place in the MCU ?

                                  • ZapaX
                                    ZapaX  15 hours back

                                    This video is dedicated to Karen, an anti-vax mom.

                                    • Roblox Cringe
                                      Roblox Cringe  15 hours back


                                      • crackerjack fox
                                        crackerjack fox  16 hours back

                                        think of this vaccines are like care packages for you immune system get care pacgaegs and you bady will win e was a vaccinate you and your kids

                                        • Illogikalli _
                                          Illogikalli _  17 hours back

                                          Anti vaccine people are retards

                                          • Ryoss
                                            Ryoss  19 hours back

                                            8.1k people are antivaxxers named Karen

                                            • aidan saikia
                                              aidan saikia  21 hours back

                                              saying vaccines are dangerous are like saying seatbelts cause car crashes

                                              • Some Guy
                                                Some Guy  6 hours back

                                                @incativated for the love of... if you want to prove your point then show us hard proof that vaccines are bad. Something to discredit the literal hundreds of researches made by professionals

                                              • Playeryboi
                                                Playeryboi  11 hours back

                                                incativated vaccines are proven to work. In the EU there is currently a measles outbreak and it’s only getting worse because you anti-vaccine fuck heads don’t do any research whatsoever and only argue with feelings. Unless you can send me a link to an article that proves vaccines don’t work and do more harm, than good I won’t change my mind.

                                              • The Shinto Railfan
                                                The Shinto Railfan  14 hours back

                                                No, @incativated, I had a fever of 103 Fahrenheit. Anything higher could've been lethal.

                                              • incativated
                                                incativated  14 hours back

                                                @The Shinto Railfan I've had many times in my life where i felt like dying.

                                            • velorien996
                                              velorien996  21 hours back

                                              BuT WhAt aBouT auTiSM?
                                              There is nothing wrong with autism Karen it normally doesn't make someone unable to function properly unlike you

                                              • Superior Mind Studios
                                                Superior Mind Studios  21 hours back

                                                Goddamn anti vaxxers🙄
                                                In my country if u don't vaccinate you will definetly die
                                                This I guarantee

                                                • aidan saikia
                                                  aidan saikia  21 hours back

                                                  *T H I S P L E A S E S K A R EN T H E A N T I V A X E R*

                                                  • Sans Zockt
                                                    Sans Zockt  22 hours back

                                                    Germs when the Body is Vaccinated:
                                                    We've been fooled, We've been tricked and quite possibly Bamboozled.

                                                    Germs when the Body is not Vaccinated:
                                                    OMAE WA MOU SHINDERU

                                                    • Mazda 787B
                                                      Mazda 787B  22 hours back

                                                      Memory cells must have Vietnam flashbacks on the daily

                                                      • Miles Gutierrez
                                                        Miles Gutierrez  24 hours back

                                                        Seatbelts are like the shock suits that storm troopers wear. In an accident where you absolutely would have died, the seatbelt could definitely save you, but in a smaller scale minor accident, it's more likely that the seatbelt is going to kill you or injure you than the car.

                                                        • Gingerbrave
                                                          Gingerbrave  1 days back

                                                          Vaccinate your kids or I'll shoot measles at you.
                                                          AND IT WON'T BE WEAKENED VACCINE VARIETY EITHER

                                                          • Guinness
                                                            Guinness  1 days back

                                                            Russian intelligence have spread a lot of anti-vaxx bull online to stoke division. That along with political fake stories, they try to disrupt our societies. Apparently over the bodies of dead children

                                                            • Haziq Aiman
                                                              Haziq Aiman  1 days back


                                                              • Krishna Karma
                                                                Krishna Karma  1 days back

                                                                Antivaxxers : Why to trust doctors and everyone else when we can trust a blogger oh kurzgesagt video that support us "clicks on the video" Why to trust youtube when we can trust the old blogger (ps: Personaly I can't imagine what makes people think like this even a illiterate one in my area understands that vaccine are soo important for their child as well as adults stupids antivaxxers lol)

                                                                • Dl3 Yeah
                                                                  Dl3 Yeah  1 days back

                                                                  Is it safe to say that anti-vax people are murderers?

                                                                  • Exxelenen Setijadi
                                                                    Exxelenen Setijadi  1 days back

                                                                    *agrees in bacteriophage *

                                                                    • MYTHICAL ENTIRES
                                                                      MYTHICAL ENTIRES  1 days back

                                                                      Anti-vaxx parents will agreed about this

                                                                      • Mitch_ Camo
                                                                        Mitch_ Camo  1 days back

                                                                        Saying vaccines causes autism is like saying seatbelts cause car crashes :/

                                                                        • e l
                                                                          e l  1 days back

                                                                          Autism does comes from these! Your facts are far off! When it comes to autism in tons of cases can be directly linked to specific shots required in the states! Video proof of children being outgoing normal children to non moving huge signs of autism directly after shots. It’s 2019 we all have tons of videos of our child now! All hit very high temperatures after vaccine then completely different child within 24 hours. Fact is you know nothing of what the government does outside of your books!!

                                                                          • orange juice
                                                                            orange juice  12 hours back

                                                                            guys he/she isn't responding because they died of polio

                                                                          • anti bully
                                                                            anti bully  17 hours back

                                                                            there is almost enough research to make a planet that says that vaccines do not cause autism.

                                                                          • Nuclear Phantom
                                                                            Nuclear Phantom  18 hours back

                                                                            My friend has autism but has a 98 total average in 8th grade. Autism doesn’t make people stupid, they just aren’t the best with social interactions. And it also comes from genetics, not flu shots.

                                                                          • SXLID
                                                                            SXLID  21 hours back

                                                                            Hi *karen*

                                                                          • MrIndecisive
                                                                            MrIndecisive  23 hours back


                                                                        • cyclopsdias
                                                                          cyclopsdias  1 days back

                                                                          10:06 I feel so bad for the poor mommy bird that sees its young dead :(

                                                                        • Firebossman77 Youtube
                                                                          Firebossman77 Youtube  1 days back

                                                                          Man I hate anti vaxers

                                                                          • EpicDingus
                                                                            EpicDingus  2 days back

                                                                            Wait isn't autism linked to genetics? Idk tho I'm 15

                                                                            • Vary Olla
                                                                              Vary Olla  48 minutes back

                                                                              Yes Epic.  Children are born autistic as a result of something in their genetic makeup results in neurocognitive deficits.  Unless those deficits are severe in nature however = an autistic child will not usually manifest signs of that autism until a latter point in their lives as their brains are still developing.  This is what I mean.

                                                                              Human children are born with the capacity for language and movement.  Yet a newborn can not immediately speak anymore than it can get up and walk or run like say a baby gazelle.  That is because it's brain is still developing those capabilities.  So it will coo and grasp at it's feet at first ---------> then it will roll around on the floor and attempt to crawl = and eventually it will make sounds and try to stand and then walk. 

                                                                              Likewise a doctor will usually wait until 12 months or later to assess an infant for neurocognitive deficits because the child can not tell us what it is feeling while the doctor can not accurately gage some capacities absent that verbal interaction.  Meanwhile vaccinations sometimes overlap this timeframe.  Accordingly some parents will conflate a diagnosis of autism with the timing of those vaccines as causing it = wrong. 

                                                                              Lastly is after the fact neurological damage which results in "autism-like" behaviors.  Before there was an MMR each year in the US we used to see thousands of children hospitalized with encephalitis from catching measles.  Today while it is possible for the MMR to cause encephalitis = thankfully that is a rare occurrence.  Because both the vaccine and the disease cause the same problem = the virus and not the vaccine per se is responsible. 

                                                                              So a child who receives the MMR and develops encephalitis which causes some neurological damage resulting in autism-like behavior would be no different than say a child who received perhaps a blow to the head from a baseball bat and who suffered brain damage as a result which precipitated autism-like behaviors.  Do baseball bats then cause autism = of course not. 

                                                                              Rather such a child is reflective of those we used to see anyways in the time before the MMR who could not tolerate exposure to measles and who reacted harshly as a result.  Most often those children who react badly to being vaccinated = have some underlying health issue which is driving the reaction since almost all children vaccinated do not react as such.  That makes the preexisting health issue responsible and not the vaccine as absent it = the child would not have reacted as they did to the vaccine.  Have a nice day.

                                                                            • The Shinto Railfan
                                                                              The Shinto Railfan  17 hours back

                                                                              Somewhat. I think the main cause is older parents.

                                                                            • Rip
                                                                              Rip  23 hours back

                                                                              @TmtoSouper That means you want to get the worst disease in the entire world...

                                                                            • TmtoSouper
                                                                              TmtoSouper  1 days back

                                                                              ye it is

                                                                          • Quiet Girl
                                                                            Quiet Girl  2 days back

                                                                            9:36 Conclusion: VACCINATE YOUR DAMN KIDS

                                                                            • Imran Qubbaj
                                                                              Imran Qubbaj  2 days back

                                                                              So basically we have a constant war in our bodies.......not scary at all....

                                                                              • Angela Lakes
                                                                                Angela Lakes  2 days back

                                                                                Does 7th grade shots hurt I'm getting it tommorw

                                                                                • Danimeme
                                                                                  Danimeme  9 hours back


                                                                                • Nighxmare
                                                                                  Nighxmare  1 days back

                                                                                  Try not to tense your muscles in the area of injection. Distract yourself with something if it’s too hard. From my experience, it hurts the most when you tense your muscles, so try to stay calm. If you relax, it’s not that bad.

                                                                                • WinxBattles Season3
                                                                                  WinxBattles Season3  1 days back

                                                                                  Angela Lakes by “less than the disease” I mean it will hurt a bit, but getting the real thing instead is about 100 times worse

                                                                                • Angela Lakes
                                                                                  Angela Lakes  1 days back

                                                                                  @OwlSong UwU thank you sweetie

                                                                                • OwlSong UwU
                                                                                  OwlSong UwU  1 days back

                                                                                  I mean, it’s just like any other shot lol. It shouldn’t hurt too much. :) Just try to stay calm beforehand