to assess the efficacy of mass bcg programmes the authors have made a comparative analysis of age-specific trends in the incidence of active tuberculosis in the three scandinavian countries , where mass vaccination of specific age-groups has been carried out since the late 1940s , and two states of the usa ( upstate new york and ohio ) , where mass bcg campaigns have never been conducted.in the three scandinavian countries a markedly more favourable incidence trend was observed in the age-groups following the first inoculation-as compared with other age-groups in the same country and with corresponding age-groups in the other countries where a different bcg programme , or no programme at all , has been applied .
C0041703
usa
C0028905
ohio