In 1909, Bryce reported that, between 1894 and 1908, mortality rates at some residential schools in western Canada ranged from 30% to 60% over five years (that is, five years after entry, 30% to 60% of students had died, or 6–12% per annum).[47] These statistics did not become public until 1922, when Bryce, who was no longer working for the government, published The Story of a National Crime: Being a Record of the Health Conditions of the Indians of Canada from 1904 to 1921. In particular, he alleged that the high mortality rates could have been avoided if healthy children had not been exposed to children with tuberculosis.[4][48][49] At the time, no antibiotic had been identified to treat the disease, and this exacerbated the impact of the illness. Streptomycin, the first effective treatment, was not introduced until 1943.[20]:381