Lab tests suggest a strain of the flu virus circulating this season may not be "well-recognized" by the flu vaccine.

With at least 33 million cases, 430,000 hospitalizations, and 19,000 deaths, this year's flu season is proving severe. CBS News Chief medical correspondent Dr. Jon LaPook weighs in on the alarming surge.

Poroshenko shuts down doubts about Zelenskyy’s legitimacy, calls for unity Lester Holt to Exit ‘NBC Nightly News' After Decade Behind the Desk Supreme Court orders new trial for Richard Glossip after decades on death row Here's the Average Social Security Benefit at Ages 62,

The flu is surging across the United States, reaching its highest severity in 15 years. Overcrowded hospitals, long ER wait times, and visitor restrictions have made this one of the worst flu seasons in recent history.

Dr. Douglas Virostko, health department medical director: "It is always bothered me when people say 'it is just the flu;' the flu is not a 'just.'”