The measles outbreak in South Carolina has taken a dangerous turn, with some children experiencing rare but serious complications such as encephalitis, or brain swelling. State epidemiologist Linda Bell confirmed this alarming development during a media briefing on February 4, according to Wired. While the exact number of affected individuals and the severity of their cases were not disclosed, encephalitis occurs in about one out of every 1,000 measles cases and has a fatality rate of one in five.
Encephalitis is a condition where the immune system attacks certain proteins produced by brain cells in response to the measles virus. This complication can have devastating consequences, highlighting the importance of vaccination in preventing such severe outcomes. The measles outbreak in South Carolina has already resulted in 876 reported cases, the majority of which are in unvaccinated children. The spread of the virus has been rapid, with nearly 3,000 cases reported across the U.S. since January 2025.
Measles is highly contagious, with each infected person capable of spreading the virus to an average of 15 individuals. Vaccination remains the most effective way to prevent measles, with the combined MMR vaccine being 93% effective after one dose and 97% effective after two doses. However, declining vaccination rates can lead to outbreaks and put vulnerable populations at risk.
Even after apparent recovery from measles, the virus can have long-lasting effects. It can cause immune amnesia, compromising the body’s ability to fight off other pathogens. In rare cases, the virus can lie dormant in the brain for years, leading to conditions like subacute sclerosing panencephalitis (SSPE), which is almost always fatal. A tragic case in Los Angeles County in 2025 resulted in the death of a child from SSPE.
The ongoing measles outbreak serves as a stark reminder of the importance of vaccination and the potential consequences of neglecting public health measures. By staying informed and taking proactive steps to protect ourselves and our communities, we can help prevent the spread of infectious diseases and safeguard public health.
