World may be ‘post-herd immunity’ to measles, top US scientist says

<p>As infections pummel communities in the US, Mexico and Canada, fear of ‘the most contagious human disease’ grows</p><p>A leading immunologist warned of a “post-herd-immunity world”, as <a href="https://www.theguardian.com/society/mmr">measles</a> outbreaks affect communities with low vaccination rates in the American south-west, Mexico and Canada.</p><p>The US is enduring the largest measles outbreak in a <a href="https://www.nytimes.com/2025/04/22/health/measles-southwest-outbreak.html">quarter-century</a>. Centered in west Texas, the measles outbreak has <a href="https://www.theguardian.com/us-news/2025/feb/26/texas-measles-outbreak-cases">killed</a> <a href="https://www.theguardian.com/us-news/2025/apr/06/texas-measles-death-child">two</a> unvaccinated children and one adult and spread to neighboring states including New Mexico and Oklahoma.</p> <a href="https://www.theguardian.com/us-news/2025/may/03/measles-post-herd-immunity">Continue reading...</a>