The Centers for Disease Control and Prevention (CDC) today confirmed 30 more measles cases reported in the United States this past week, raising the national total to 1,828 confirmed cases so far in 2025.
Current US hot spots are Utah, Arizona, and South Carolina, where outbreaks among predominately unvaccinated or under-vaccinated people have led to community spread and widespread quarantines at schools.
In total, the country has had 46 outbreaks this year of three or more cases; for comparison, 16 outbreaks were reported during all of 2024.
Today Arizona officials said there are now 155 measles cases in that state, 151 of which are in Mohave County. The total represents two new cases, both in Mohave County.
Arizona officials said 97% of people who have gotten measles this year in the state are unvaccinated. Nationally, 92% of measles patients this year are unvaccinated or have unknown vaccination status, while 4% each have one dose of measles-containing vaccine or two full doses.
RSV activity rising
This week the CDC resumed publishing data on its respiratory illness channel, following a similar return of the weekly FluView report.
Nationally, respiratory illness activity is low, but there are increasing reports of seasonal flu activity among children and young adults. COVID-19 activity is low across the country.
Only three states reported moderate acute respiratory illness activity: Louisiana, Alabama, and New Hampshire.
RSV activity is on the rise in the South and Southeaste, with increased emergency department visits among children ages 0 to 5 years, the CDC said.
The CDC added that it will be updating respiratory surveillance data on Fridays, the same day FluView is published.
