And none of these kids were under 5, so how is that figure relevant? At least try to compare apples to apples here.
According to the news, some of the Kamloops children were as young as 3. Even so, many of the childhood diseases we vaccinate for today were real child killers back then. It was also an era with no antibiotics and many of the other drugs and medical advances we take for granted. On average, Canadians live 24 years longer than they did in 1922.