Flu killed 172 American children this season

Flu killed 172 children in the U.S. between October and May, making this season one of the deadliest since federal health authorities began tracking pediatric deaths 14 years ago, according to a new government report.

The figure reported Friday by the Centers for Disease Control and Prevention (CDC) exceeds the 171 child deaths reported for 2012-13, the previous record for a regular season. Only the 2009 swine flu pandemic, which killed 358 children, was worse; that flu was a new strain of the respiratory virus for which people had no previous exposure.

About half of this season’s deaths were in otherwise healthy children. They ranged in age from eight weeks to 17 years. Of those for whom a flu shot is recommended, less than one-fourth of the children who died had been fully vaccinated. That was about the same proportion as in past winter flu seasons.

The number of pediatric flu deaths “is a record number since we’ve been keeping track, outside of the pandemic,” said Daniel Jernigan, who heads the CDC’s influenza division. And the number is considered an undercount because it only includes lab-confirmed cases that are listed on death certificates and then reported to the CDC. It could go even higher because of reporting delays.

“It’s probably half of what actually occurs because there are times when children die even before they get to the emergency room,” Jernigan said in an interview.

More than 40 per cent of this season’s young victims died before they were hospitalized.

States are not required to report individual seasonal flu cases or adults’ deaths. The CDC uses mathematical modelling to estimate total flu-related deaths. Because flu seasons vary in length and severity, the agency estimates that flu-related deaths in the United States ranged from a low of 12,000 (during 2011-12) to a high of 56,000 (during 2012-13).

Data released this week by

CDC gives the fullest picture so far, of a season that was notable for the volume and intensity of cases, which overwhelmed hospitals and led Alabama to declare a state of emergency. Some hospitals were forced to pitch tents outside emergency rooms. Other facilities had bed shortages that kept ambulances idling outside.

This season’s predominant strain was H3N2, the most dreaded flu strain. It’s associated with more complications, hospitalizations and deaths, especially among children, people older than 65 and those with certain chronic conditions.

But even though officials knew it was likely to be a harsh season, they weren’t expecting virtually the entire country to be slammed at the same time and across all age groups. In past years, the flu more commonly appeared in different parts of the country at different times.

Flu seasons typically last between 16 to 20 weeks. The 2017-18 season was 19 weeks. Flu activity began ramping up in November, reached high levels in January and February, and stayed elevated through March.

It’s not common for two consecutive flu seasons to be dominated by H3N2, although that’s what happened in 2016-17 and 2017-18. No one knows how the next season will shape up, or whether the same virulent strain will dominate, but “sometimes we’ve had two or three in a row,” Jernigan noted.

Jernigan said the coming season’s vaccine production process includes a strain that is expected to perform better against the H3N2 strain.