The UK was first declared measles-free in 2017, but lost the status two years later, before regaining it after spread of the virus was almost halted completely in 2021 – although that was mainly because social distancing during the pandemic.
Outbreaks in late 2023 meant measles started spreading more quickly again, leading to the surge in cases in 2024.
Vaccination uptake at the end of 2024 was 92% for the first dose and just below 85% for the second dose.
Dr Vanessa Saliba, consultant epidemiologist at UKHSA, said: “Infections can return quickly when childhood vaccine uptake falls – measles elimination is only possible if all eligible children receive two MMRV doses before school.
“The NHS is making vaccination easier, including offering the second MMRV dose earlier at a new 18-month appointment to boost uptake and support elimination goals.”
She said older children and adults could still get vaccinated as the NHS offered catch-up jabs.