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The cumulative incidence of tumours was registered in CBA mice inoculated with adenovirus type 12 when newborn and treated with BCG in different ways during the latency period. A single subcutaneous dose of BCG at 3–4 weeks of age had a preventive effect, while no prevention could be recorded after a single BCG dose at 9 weeks of age or eight BCG injections at intervals of 1 week. Sera obtained du
