The number of measles cases nationwide has risen by 42 the in past week, the Centers for Disease Control and Prevention (CDC) reported today in its latest update. There are now 1,723 confirmed measles cases this year, reported by 43 jurisdictions.

Eighty-seven percent of measles cases are outbreak-associated, and there have been 45 US outbreaks in 2025. Among measles patients, 92% have been unvaccinated or had an unknown vaccine status. Only 4% have received both doses of measles-containing vaccine.

Last year the United States had 285 measles cases. US measles activity is the highest it has been since measles was declared eliminated in the country in 2000. 

Lost elimination status for Americas

Earlier this week, Canada lost its elimination status after it failed to contain a nationwide outbreak for 12 months that has topped 5,000 infections. This dubious milestone also meant a loss of elimination status for the entire Americas region. 

The United States will be on track to follow Canada in January 2026, which will mark 12 months since a large West Texas measles outbreak began. 

Current hot spots include the Utah-Arizona border and Upstate South Carolina. 

A new study of children with ear infections suggests that wider uptake of "watchful waiting" could help reduce unnecessary antibiotic use, US researchers reported yesterday in the Journal of the Pediatric Infectious Diseases Society.

Led by researchers with the University of Utah and Intermountain Health, the multicenter, retrospective observational study analyzed data on children ages six months to 17 years who received a diagnosis of acute otitis media (AOM) in ambulatory practice settings at health systems in Illinois, Colorado, and Utah from July 2018 through December 2023. 

The aim was to determine visits in which children received an immediate antibiotic prescription (within 2 days of the index visit) and those that used watchful waiting, a strategy that can involve monitoring symptoms and prescribing an antibiotic only if it's needed, or a delayed antibiotic prescription. The researchers also evaluated the outcomes associated with the two approaches.

The study authors note that roughly 100 million antibiotic courses are prescribed for children with AOM annually, though over 80% of cases resolve on their own.

"Randomized clinical trials have shown that watchful waiting can reduce antibiotic use for AOM by approximately 60% with similar patient outcomes and parent satisfaction to immediate antibiotic use," the authors wrote. "Despite these favorable data, evidence suggests watchful waiting is utilized in only 5-20% of cases."

Favorable clinical outcomes 

Of the 140,579 visits for AOM, an immediate antibiotic was prescribed in 84.4%, and watchful waiting was used in 15.6%. Of the watchful-waiting patients, 56% were not prescribed an antibiotic, and 44% received a delayed prescription. Rates of treatment failure and recurrence were low in both groups, with only 6% of the watchful-waiting group and 7% of the immediate antibiotic group receiving any antibiotic 3 to 30 days after the index visit.

"When watchful waiting was utilized, clinical outcomes were favorable as evidenced by the infrequent need for a new antibiotic prescription in the 30 days after the index visit," the authors wrote. "Interventions to scale up use of watchful waiting for AOM may therefore be a high-yield approach to reduce unnecessary antibiotic exposure for children with AOM."

Eight suspected cases of viral hemorrhagic fever of unidentified cause in Ethiopia have prompted the World Health Organization (WHO) to dispatch a team of responders and deliver medical supplies to the southern part of the country, near its border with South Sudan.

In a news release today, WHO Africa said that Ethiopian health authorities are ramping up their response and conducting lab tests to identify the cause of the infection and stop further transmission.

"To support the national authorities, WHO is deploying a multi-disciplinary team of 11 technical officers with experience in responding to viral haemorrhagic fever outbreaks to help strengthen disease surveillance, investigation, laboratory testing, infection prevention and control, clinical care, outbreak response coordination and community engagement," the WHO wrote.

Ethiopia's Health Ministry will likely announce the results of the ongoing investigation tomorrow, according to media reports.

Provision of personal protective equipment, financial aid

The WHO is providing essential supplies such as personal protective equipment for healthcare workers, infection-prevention materials, and a rapidly deployable isolation tent to improve clinical care and boost management capacity. 

WHO is deploying a multi-disciplinary team of 11 technical officers with experience in responding to viral haemorrhagic fever outbreaks.

The organization has also released $300,000 from its Contingency Fund for Emergencies to provide immediate support and is marshaling technical capacity to support the response.   

Viral hemorrhagic fevers, a group of epidemic-prone diseases caused by several distinct families of viruses, include Marburg, Ebola, Crimean Congo hemorrhagic fever, and Lassa fever. 

Signs and symptoms vary by virus, but initially they often include high fever, fatigue, dizziness, muscle aches, weakness, and exhaustion. All cases, whether single or in clusters, should be immediately reported to health authorities without waiting for identification of the causative pathogen, the WHO said.