ABSTRACT
One hundred nine cases of poliomyelitis admitted to the Polio Pavilion of the San Lazaro Hospital in 1961 were studied. At least paired serum samples and in some instances, triple serum samples were collected from them. Ninety-one had matching stool specimensVirus isolation was done on the 91 stool samples and complement fixation test on the 129 paired or triple serum samplesThe pertinent findings were as follows: (1) only half of the cases clinically recognized as poliomyelitis could be confirmed by either or both tests employed; (2) about one-third of the agents isolated from stools were non-polio; (3) the most prevalent type of poliovirus causing clinically apparent illness is type 1. The least common is type 2; (4) poliomyelitis is still an infantile type of disease in this country since the majority of the confirmed cases occurred in the age group 0-23 months; (5) maternal antibodies may cease to be protective even before an infant reaches 4 months of age; (6) during the period of study, cases of poliomyelitis were more or less evenly distributed throughout the year. (Summary)