Measles Outbreak Exposes Vulnerability of Unvaccinated Babies

South Carolina sees largest U.S. measles outbreak in decades, raising concerns over vaccine hesitancy and herd immunity

Apr. 13, 2026 at 4:24am

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A translucent X-ray photograph revealing the delicate internal structures of a baby's head and shoulders, conveying the fragility of infants too young to be vaccinated against preventable diseases.The measles outbreak in South Carolina highlights the urgent need to protect the youngest and most vulnerable members of the community.Spartanburg Today

A recent measles outbreak in South Carolina, the largest in the U.S. in decades, has highlighted the critical issue of babies too young to be vaccinated being left vulnerable during outbreaks. The outbreak has brought to light the importance of herd immunity and the dangers of declining vaccination rates, as well as the influence of anti-vaccine activists on public opinion and policy.

Why it matters

The measles outbreak in South Carolina underscores the far-reaching consequences of vaccine hesitancy, which not only endangers babies and young children but also threatens the progress made in eliminating vaccine-preventable diseases. The erosion of herd immunity puts the entire community at risk, particularly those who cannot be vaccinated.

The details

The outbreak in Spartanburg County has been fueled by the ease of obtaining religious exemptions from vaccine requirements, allowing some families to opt out and further weaken herd immunity. Anti-vaccine activists like Robert F. Kennedy Jr. have contributed to the spread of misinformation and the decline in public trust in vaccination, leading to a rise in vaccine exemptions.

  • The recent measles outbreak in South Carolina is the largest in the U.S. in decades.
  • The outbreak began in Spartanburg County in early 2026.

The players

Robert F. Kennedy Jr.

A longtime anti-vaccine crusader who has been involved in shaping vaccine policy and pushing for vaccine hesitancy, contributing to the erosion of trust in vaccination.

Spartanburg County

The county in South Carolina where the recent measles outbreak, the largest in the U.S. in decades, has occurred.

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What’s next

Experts and policymakers must address the concerns surrounding vaccine hesitancy and work towards a more robust and transparent approach to public health policies to ensure the protection of vulnerable populations, such as babies too young for vaccination.

The takeaway

The measles outbreak in South Carolina underscores the critical need for maintaining high vaccination rates to protect the entire community, especially those who cannot be vaccinated. Addressing vaccine hesitancy and strengthening herd immunity are essential to preventing the resurgence of vaccine-preventable diseases.