No, the CDC hasn’t issued a ‘health advisory’ about the XBB COVID-19 subvariant

“Everyone is advised to wear a mask because the new COVID-Omicron XBB variant of coronavirus is different, deadly and not easily detected properly,” the Facebook post reads in part.

The post also claims that XBB is “5 times more toxic” than the delta variant of COVID-19.

Several VERIFY readers asked us if the Facebook posts are legitimate.

THE QUESTION

Has the CDC issued a health advisory about the XBB COVID-19 subvariant?

THE SOURCES

THE ANSWER

No, the CDC has not issued a health advisory about the XBB COVID-19 subvariant. 

WHAT WE FOUND

There is no evidence of the CDC issuing a health advisory about the XBB subvariant on its website or social media accounts. 

The federal health agency’s most recent press release about COVID-19 was shared on July 13 and provides information about free vaccines for some Americans in the fall.

VERIFY also searched the official CDC accounts on Facebook and X, formerly known as Twitter, and did not find any posts about a health advisory for XBB. 

We did find posts on Facebook and X with a nearly identical message about the XBB subvariant from October and November 2022. This means the posts are likely copypasta, which is internet slang for a block of text that gets copied and pasted repeatedly. 

 Many of the posts’ claims about the XBB subvariant are either false or unproven. 

The omicron variant and its subvariants, including XBB, have been associated with less severe infections than those caused by earlier strains of COVID-19 such as the delta variant.

In October 2022, the World Health Organization (WHO) said data did not suggest any “substantial differences in disease severity” for XBB infections. 

This has also been the case for other strains descended from the XBB subvariant, such as EG.5. The WHO said in its initial risk evaluation of EG.5 that there have been “no reported changes in disease severity to date.”

Health experts have not reported any significant changes in symptoms caused by the XBB subvariant or strains descended from it, either. 

The American Medical Association says the XBB.1.5 strain causes cold symptoms such as cough and congestion. Other symptoms can include fever, chills, fatigue, aches, sore throat, nausea and diarrhea. 

EG.5 also “tends to infect the upper respiratory tract,” leading to cold-like symptoms, according to Yale Medicine.

The CDC did not respond to multiple requests for comment by the time of publication.