Amid the largest measles outbreak in 30 years, health officials in Ontario are 'flying a bit blind', a leading immunization expert is warning.
Ontario health officials are unsure about the true measles threat due to an outdated system for tracking vaccinations. The province is experiencing its worst outbreak since 1998, with cases rising and spreading, and vaccination rates among children are below the level needed to prevent outbreaks. Officials are struggling to accurately assess vaccination coverage and gaps due to reliance on outdated methods like yellow booklets and self-reporting.
