UK & US Measles Elimination Status at Risk: Outbreaks & WHO Review
- The United Kingdom has lost its measles elimination status, a designation conferred by the World Health Organization (WHO) when a country demonstrates no sustained, local transmission of the...
- The WHO determines measles-free status based on case rates, requiring a country to maintain no locally transmitted cases of the same strain for at least 12 months.
- Outbreaks began to escalate in the UK in late 2023, leading to a significant surge in cases throughout 2024.
The United Kingdom has lost its measles elimination status, a designation conferred by the World Health Organization (WHO) when a country demonstrates no sustained, local transmission of the virus. This announcement, made on , reflects a concerning resurgence of measles cases in recent years, a trend observed not only in the UK but also in several other European and Central Asian nations, including Spain, Austria, Armenia, Azerbaijan, and Uzbekistan.
The WHO determines measles-free status based on case rates, requiring a country to maintain no locally transmitted cases of the same strain for at least 12 months. The decision regarding the UK was based on data from , when suspected cases were reported, according to the BBC. This followed a previous loss of elimination status in , which was briefly regained in largely due to the impact of social distancing measures implemented during the COVID-19 pandemic.
Outbreaks began to escalate in the UK in late , leading to a significant surge in cases throughout . The UK Health Security Agency (UKHSA) reported laboratory-confirmed measles cases in England alone during , the highest number recorded since .
A key factor driving this resurgence is declining vaccination rates. To achieve and maintain measles elimination, a community needs approximately vaccination coverage with two doses of the measles, mumps, and rubella (MMR) vaccine. However, vaccination uptake at the end of was for the first dose and just below for the second dose, falling short of the necessary threshold for herd immunity.
Dr. Vanessa Saliba, a consultant epidemiologist at UKHSA, emphasized the importance of vaccination, stating, “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 actively working to improve vaccination rates, including offering the second MMRV dose earlier, at an appointment.
The situation in the UK mirrors a broader trend across Europe. In , the WHO European Region reported measles cases, more than double the number reported in ( cases) and the highest total since .
United States Faces Potential Loss of Elimination Status
The resurgence of measles is not limited to Europe. The United States is also facing a growing threat, with the Pan American Health Organization (PAHO) recently issuing a warning regarding the country’s elimination status. Canada lost its measles elimination status in November after reporting more than cases of sustained transmission.
PAHO has scheduled a virtual meeting with the United States and Mexico on , to review their respective elimination statuses. Measles outbreaks were first reported in the US on , and in Mexico on .
In , the US recorded measles cases, the highest number in years, surpassing the cases reported in . The outbreak was largely driven by a significant outbreak in Texas, which infected individuals and resulted in two fatalities before being declared over in August .
The trend has continued into . As of , the CDC has reported confirmed measles cases nationally. South Carolina is currently experiencing the most significant outbreak, with cases reported as of ( in and in ).
While the Texas and – South Carolina outbreaks are not linked, the US risks losing its measles elimination status if it cannot consistently and rapidly interrupt the spread of the virus.
Measles is a highly contagious viral infection that can lead to serious complications, including pneumonia. In rare cases, it can cause subacute sclerosing panencephalitis (SSPE), a fatal neurological condition.