Measles is one of the most challenging diseases to control. It requires a sustained uptake of well over 90% of two doses of a measles-containing vaccine such as MMR. But since the COVID pandemic, there has been a decline in uptake of routine vaccines in many countries including the US, Canada and Europe, resulting in outbreaks of the disease.
For instance, despite eliminating measles in 2000, the US experienced an outbreak in April 2025. In Texas, the centre of this outbreak, 57 people were hospitalised and two unvaccinated school-aged children died.
