South Carolina measles outbreak is largest in US since measles was declared eliminated

January 27, 2026 - 23:54

Health officials are sounding the alarm as a rapidly expanding measles outbreak in South Carolina has become the largest seen in the United States since the disease was declared eliminated domestically in 2000. The resurgence of this highly contagious virus highlights growing concerns over gaps in community immunity.

Measles spreads through the air when an infected person coughs or sneezes, and it can linger in a space for up to two hours after they leave. Symptoms typically begin with high fever, cough, runny nose, and watery eyes, followed by a characteristic red rash. Complications can be severe, especially for young children and infants, and include pneumonia and encephalitis.

The outbreak's size underscores the critical importance of vaccination. The Measles, Mumps, and Rubella (MMR) vaccine is exceptionally effective, with two doses providing about 97% protection against the virus. Public health experts stress that high vaccination coverage is essential to protect those who cannot be immunized, such as infants under one year old or individuals with certain compromised immune systems, by creating community-wide herd immunity.

Authorities are urging all residents to verify their vaccination status and to isolate and seek medical guidance immediately if they develop symptoms, calling ahead to healthcare facilities to prevent further exposure. This outbreak serves as a stark reminder that vaccine-preventable diseases remain a persistent threat when immunization rates falter.