The World Health Organization convened an emergency advisory committee on Sunday to assess the rapidly escalating measles situation after case counts in at least a dozen countries surpassed outbreak thresholds within a single week. Officials confirmed that the gatherings, scheduled after alarming surveillance data emerged from regional health offices in Nairobi, Bucharest, and São Paulo, reflect growing institutional concern that endemic transmission is being re-established in populations that had previously achieved elimination status.

At the centre of the crisis are infants under 12 months of age who remain ineligible for the measles-mumps-rubella vaccine under standard immunisation schedules. Health authorities in Romania and Nigeria reported that children in this age bracket accounted for more than 60 percent of hospitalised measles patients over the past fortnight, a figure that WHO Director-General Dr. Tedros Adhanom Ghebreyesus described as 'a preventable tragedy unfolding in slow motion.'

Public health officials point to a convergence of factors driving the resurgence: pandemic-era disruptions to routine immunisation that left cohorts of now school-age children under-vaccinated, alongside a measurable rise in vaccine hesitancy in parts of Western Europe and North America. In Romania alone, coverage for the first MMR dose fell to 76 percent in 2024, well below the 95 percent threshold required for herd protection, according to ECDC data.

The committee is expected to issue interim guidance urging member states to lower the minimum age for emergency vaccination in outbreak settings from 12 to 6 months, a protocol already deployed with success during previous outbreaks in the Democratic Republic of Congo. UNICEF simultaneously announced it was pre-positioning an additional 4 million vaccine doses in high-risk African and Eastern European corridors, drawing on emergency stockpiles held in Copenhagen.

Epidemiologists warn that without rapid containment, the northern hemisphere spring — marked by school gatherings, religious festivals, and seasonal migration — could accelerate transmission chains significantly. 'The virus does not wait for committee reports,' said Dr. Kate O'Brien, WHO's director of immunisation. 'Every day without a surge response is a day more infants are exposed.' A formal public health advisory is anticipated by the end of the week.