2) Postvaccinal adverse events of the central nervous system:
Other classifications of postvaccinal reactions can be found in the literature, some of which put an emphasis on the neurological symptoms, while others emphasize the immunological mechanisms.
describing neurological complications, have included as "minor"--mild or severe postvaccinal reactions, occurring up to 48 hours after injection and disappearing without leaving permanent sequelae, the following: prolonged crying, restlessness and hyperactivity, apathy with increased sleepiness, high body temperature, a temporary mild increase in intracranial pressure manifested by a throbbing crown of the head, "cerebral cry" (sometimes included among "major" complications) [5-7].
Among the "major" neurological complications, usually manifesting more than 48 hours after vaccination and which might be the cause of permanent damage to the central nervous system (CNS), the following are listed: seizures especially if there is no increase in body temperature, hypotonic-hyporesponsive episodes, postvaccinal encephalitis, postvaccinal encephalopathy [6, 8-11] and autism [10, 12-14].
Konior and Strozik  have proposed their own classification of postvaccinal reactions taking into account the contribution of the immune system in the vaccinated children.
unrelated to the immune system--patients whose postvaccinal reactions may be related to the toxic effects of the vaccine components or may result from the vaccine virus turning virulent, resulting in complete or abortive symptoms of the disease.
Local postvaccinal reactions (redness, swelling, pain at the injection site) occurring particularly often after the administration of live vaccines (10.
Generalized postvaccinal reactions (fever, malaise, muscle pain, joint pain, headaches, flu-like symptoms, local lymphadenopathy, allergic reactions)--usually disappear spontaneously within 3 days of vaccination, do not require treatment .
Early postvaccinal complications--anaphylactic reaction, described in one in about 1 million of vaccinated individuals, occurs most often after immunization against typhoid, tetanus, pertussis, measles, mumps, rubella .
Reports in many Polish and foreign medical journals lead us to conclude that postvaccinal complications among children can be observed in sporadic cases and that they are disproportionate to the benefits of vaccination in the elimination of dangerous diseases in childhood.