WINNIPEG -- Infectious disease experts and advocates for frontline workers are calling for a revised vaccination strategy amid growing concern over the severity of more infectious COVID-19 variants in younger people. Experts who spoke to CTV News said vaccinating based on age was the right strategy to start, but they are now calling on provinces to push younger workers providing essential services closer to the front of the line. Dr. Alexander Wong, an infectious-disease physician in Regina, Sask., said a revised strategy is needed because of an increasing number of severe outcomes in younger Canadians as more transmissible variants circulate.