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February 15th, 2011 
asilonline * This post is translation from spanish to english
As any other medical or therapy drug, vaccines can have side effects that depend in great part of the response of the host, i.e., of individual factors that can not be predicted.
There are minor side effects of type local swelling and pain at the injection site.
Or affecting infants generally moderate fever, crying and bad mood for a couple of hours.
In fewer cases, complications may be more intense as:
Infection at the site of injection (abscess).
Fever higher than 40 °, with consequent discomfort.
This fever means a risk of febrile seizures.
On very rare occasions (between 2 and 30 cases for every million doses of vaccine) can produce a lesion of the brain or encephalopathy.
However, we must remember that the risk of the same injury from occurring is much higher in case of the disease.
To assess the relative risk of serious complications of vaccines, different statistics provide us with some figures.
For example, if there were one million patients, could die between 1,000 and 40,000 children. While for each administered vaccines million could die 2 children.
6,000-20,000 Children without vaccine may have brain damage. Children vaccinated only at encephalopathy risk between 2 and 30 children.
Almost safely, children without vaccine between 6,000 and 80,000 children they would have seizures. Vaccinated children, some may also have seizures, but only from 3 to 900.
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