CDC

"The person developed symptoms over the weekend and tested positive late Sunday," Dr. Satish Pillai, the incident manager for the agency's Ebola response, told reporters on a media call.

A "level 3" designation is standard at this stage and is the lowest CDC emergency activation level, with the agency actively monitoring the virus's progress.

Health experts warn that both the CDC and the WHO may face disadvantages from a lack of cooperation between the two organizations.

"The risk to the wider public remains low," said Hans Kluge, WHO Europe's regional director, in his own X post. "There is no need for panic or travel restrictions."

"Scientific reports are routinely reviewed at multiple levels to ensure they meet the highest standards before publication," said HHS spokesperson Andrew Nixon.

The nickname “Cicada” reflects how the variant seemed to reemerge after a long lull.

The committee, which makes recommendations on who should receive which vaccines, has historically guided US health insurance coverage and state policies on school-required vaccines.

The states - California, Colorado, Illinois, and Minnesota - said they were being unlawfully subjected to "devastating funding cuts to basic public health infrastructure based on political animus."

Federal health officials are weighing vaccine guidance and moving away from the CDC's current model of universal recommendations for childhood vaccination.

Instead of acting quickly to prevent a measles comeback, Robert F. Kennedy Jr. has undermined public health officials' ability to prevent and contain outbreaks.