CBC | 11 Nov 2015
Alberta health officials say vaccine problems could be partly to blame for two long-standing outbreaks of whooping cough in the province.
“In some cases the vaccine may be waning, so the protective effect may wear off just before kids get their Grade 9 booster,” said Dr. Digby Horne, central Alberta’s chief medical officer.
“And in some cases there is vaccine failure as well,” he said, noting that roughly one-third of cases are in people who have been immunized.
