[PPD screening in school children with and without BCG vaccination]

In this work PPD screening has been carried out in BCG vaccinated and unvaccinated school children of various socioeconomical conditions in Sivas. The Immunity and infection ratios in vaccinated children according to being vaccinated one, two, three, four, five and more then five years ago were as follows; 37.7% and 8.4%, 29.4% and 7.3%, 28.5% and 6.0%, 32.3% and 4.2%, 26.0% and 10.9%, 27.3% and 5.5% respectively. There wasn't any significant difference from statistical point of view among these groups (P greater than 0.05). The ratio of tuberculosis++ infection was 26.5% in the unvaccinated group where as in the vaccinated group it was only 6.6%. When the ratios of these groups were compared from the statistical point of view the difference was found to be significant (P less than 0.05).