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The worst possible scenario is that you have an allergic reaction to the vaccin.
A vaccin consists of one or more antigens injected into your body. An antigene is a "marker" of a specific virus/bacteria toxin etc.. Therefore you are not actually being injected with a "disease" of any sorts.. Just the marker of the infectious agent. Your body remembers this marker. If you are then infected with the infectious agent associated to this marker later in your life (virus, bacteria toxin etc..) your body can react alot faster and supress the infectious agent because it's already seen in before and remembered it.
The Antigene injected is not at all harmeful. As i said, the worst thing that could happen is an allergic reaction to that antigene (very rare).
Common reactions are a slight fever or "cold" symptons, which are just proof that your immune system is working correctly.
P.s: Just a side note, some vaccins are not antigenes but suppressed toxins or viruses. This means that you ARE being injected with an infectious agent, BUT that it has been geneticly modified to cause no harm. I could say that there might be a risk that the infectious agent was not sufficiently suppressed, but that NEVER happens with all the strict procedures and tests vaccins have to go through.
Hope i helped.
What else can I help you with?
What is vaccine means?
It means to be given a vaccine to counteract a possible virus.
What Precaution to be taken after injecting 2009 flu pandemic vaccine?
Observe for signs of allergic reaction to the vaccine.
Can puppy have serious reaction to vaccine 26hrs after injection?
A puppy can have a serious reaction to a vaccine 26 to 48 hours after injection. Some of these reactions may include swelling, rashes, or vomiting.
Does serum make up vaccine?
From serum it is possible to make vaccine (because it contains Antibodies)
Your son has small bumps all over his body but no fever He just had his chickenpox vaccine?
Patients sometimes get a rash after chickenpox vaccine. It is possible that he could be contagious if his bumps are due to vaccine. He could be having an allergic reaction to the vaccination, or it could be a coincidence, and not be related to the vaccination. Contact your health care provider for advice specific to your health history.
Can one inject a vaccine through a tattoo?
Yes, but it may alter the appearance of the tattoo, also you won't be able to see if there is an adverse reaction to the vaccine- redness, etc because the tattoo will mask the reaction.
How is the bodys reaction to a vaccine similar to its reaction when it is attacked by a virus?
They are actually the same. Except that the vaccine isn't going to cause the disease. It is just going to prep the body for a time when it will be exposed to that virus or bacteria.
What is the possible reaction of ZnCl2 and Br2?
The reaction is not possible.
Is it possible for a composition reaction to also be a combustion reaction?
A composition reaction (sometimes also called a combination reaction.
Which has worst side effects the flu or the flu vaccine?
The flu. One of the side affects of flu can be death.
Can bordatella vaccine cause vomiting in dogs?
Yes, it is possible for the Bordetella vaccine to cause vomiting in dogs as a side effect. This is not a common reaction, but it can occur in some cases. If your dog experiences vomiting after vaccination, it is best to consult with your veterinarian for guidance.
Which vaccine should not be administered to a person with a history of severe allergic reaction to neomycin?
MMR
