Abstract
One hundred and ten cases of infantile spasms with detailed information about immunization available were selected as the material to evaluate the significance of immunization as an etiological factor of infantile spasms. In 80% of the cases, immunization could not be considered to have any relation with causation of infantile spasms, bacause 44 cases (40%) never had innoculations as yet, and other 44 cases (40%) had been immunized by some vaccines over one month before or after the onset of the disease. The remaining 22 cases, in whom immunization had been performed within one month before the onset of the disease, constituted the candidate for further study.
