---
title: "Measles Cases Erupt in US After Over 25 Years Without Continuous Spread"
url: https://newscentral.site/measles-cases-erupt-in-us-after-over-25-years-without-continuous/
language: en
publisher: "News Central Site"
section: "Science"
published: 2026-11-14T04:07:49.000Z
updated: 2026-11-14T06:24:02.094Z
id: d474e93f-f793-45a2-a74a-d9ca2003b12b
source: "Live Science https://www.livescience.com/health/viruses-infections-disease/measles-is-back-in-the-united-states-who-authorities-say"
attribution: "Link to https://newscentral.site/measles-cases-erupt-in-us-after-over-25-years-without-continuous/ and name News Central Site when you quote or summarize this story."
---

# Measles Cases Erupt in US After Over 25 Years Without Continuous Spread

A series of major measles outbreaks has prompted the Pan American Health Organization to reassess the country's elimination status.

Measles cases have started appearing in the United States after more than 25 years without continuous domestic spread of the disease.

The country was officially declared measles-free in 2000, but occasional outbreaks still occurred due to travelers bringing the virus into the country.

These isolated incidents did not lead to ongoing transmission of the disease within the US population.

However, a recent series of major measles outbreaks has changed this status, prompting the Pan American Health Organization (PAHO) to reassess the country's elimination status.

The PAHO, which is the regional office of the World Health Organization for the Americas, has now determined that the US should be considered non-eliminated.

This decision comes after a significant increase in measles cases, with nearly 2,300 reported nationwide in 2025 and over 5,412 confirmed so far this year.

A leading health expert has warned that the resurgence of measles could be the point of no return, as outbreaks become increasingly difficult to control.

The resurgence of measles in the US is a stark reminder that maintaining high vaccination rates is crucial to preventing large outbreaks.

For measles, achieving herd immunity requires at least 95% of the population to be immune through either vaccination or past infection, as its virus spreads rapidly and easily from person to person.

In recent years, however, national measles vaccination rates have been steadily declining, with only 10 states reporting rates above the critical threshold among kindergarteners for the 2025-2026 school year.

Experts point to a combination of factors contributing to this trend, including decreasing funding and personnel for public health initiatives as well as wavering confidence in vaccines and scientific expertise among the general population.

The appointment of an individual with a history of questioning vaccine safety and efficacy has likely exacerbated these issues by creating confusion around established vaccine guidance.

According to health authorities, a significant number of measles cases in the United States result in death, with approximately 1 to 3 out of every 1,000 cases being fatal.

The high number of reported deaths in Pennsylvania is particularly concerning, as it suggests that the state's true case rate may be higher than what has been captured by data. With over 1,500 measles cases recorded in the state, this discrepancy raises questions about the accuracy of the reported numbers.

Measles can have severe long-term health consequences for survivors, including brain damage and immune amnesia. In individuals who contract the virus, their immune system's "memory" is essentially wiped clean, leaving them vulnerable to other infections.

The recent surge in measles cases in the United States serves as a stark reminder of the importance of vaccination and immunity.

---
Source: [Live Science](https://www.livescience.com/health/viruses-infections-disease/measles-is-back-in-the-united-states-who-authorities-say)  
Published by News Central Site: https://newscentral.site/measles-cases-erupt-in-us-after-over-25-years-without-continuous/