Respiratory illnesses that include a fever plus a cough or soar throat, causing people to seek medical care in the United States, have increased in the last two weeks in most parts of the country, the U.S. Centers for Disease Control said on Friday.

"This week, 22 jurisdictions experienced high or very high activity compared to 37 jurisdictions two weeks ago," the agency said in an update. 

While COVID-19, RSV and flu positivity rates remained elevated nationally, COVID and RSV positivity rates decreased compared to last week, and flu rates stayed about the same.