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New Study Shows Flu Vaccine Reduced Children's Risk of Intensive Care Unit Flu Admission by Three-Fourths

ATLANTA, March 27, 2014 /PRNewswire-USNewswire/ -- Getting a flu vaccine reduces a child's risk of flu-related intensive care hospitalization by 74 percent, according to a CDC study published today in the Journal of Infectious Diseases.

The study is the first to estimate vaccine effectiveness (VE) against flu admissions to pediatric intensive care units (PICU). It illustrates the important protection flu vaccine can provide to children against more serious flu outcomes. CDC recommends annual flu vaccination for everyone 6 months and older and especially for children at high risk of serious flu-related complications.

"These study results underscore the importance of an annual flu vaccination, which can keep your child from ending up in the intensive care unit," said Dr. Alicia Fry, a medical officer in CDC's Influenza Division. "It is extremely important that all children – especially children at high risk of flu complications – are protected from what can be a life-threatening illness."

Children younger than 5 years and children of any age with certain chronic medical conditions like asthma, diabetes or developmental delays, are at high risk of serious flu complications.

Fry's team analyzed the medical records of 216 children age 6 months through 17 years admitted to 21 PICUs in the United States during the 2010-2011 and 2011-2012 flu seasons. They found that flu vaccination reduced a child's risk of ending up in the pediatric intensive care unit for flu by an estimated 74 percent. These findings show that while vaccination may not always prevent flu illness, it protects against more serious outcomes.

Though flu vaccination was associated with a significant reduction in risk of PICU admission, flu vaccine coverage was relatively low among the children in this study: only 18 percent of flu cases admitted to the ICU had been fully vaccinated.

More than half (55 percent) of cases had at least one underlying chronic medical condition that placed them at higher risk of serious flu-related complications.

CDC usually measures flu VE against "medically attended flu illness" – that is, how well it protects against having to go to the doctor for flu symptoms. During the 2010-2011 and 2011-2012 seasons, the midpoint VE estimates against medically attended illness were 60 percent and 47 percent respectively.

"Because some people who get vaccinated may still get sick, it's important to remember to use our second line of defense against flu: antiviral drugs to treat flu illness," Fry said. "People at high risk of complications should seek treatment if they get a flu-like illness. Their doctors may prescribe antiviral drugs if it looks like they have influenza."

Symptoms of flu may include fever, cough, sore throat, runny or stuffy nose, body aches, headache, chills, and sometimes diarrhea and vomiting.

Flu causes hospitalizations in children each season, but how many children are affected varies, depending on the severity of the season. CDC estimates that 20,000 children younger than 5 years are hospitalized on average each year. For children younger than 18 years, published studies suggest an annual range of flu-related hospitalization rates of between one child and seven children per 10,000 children. Between 4 percent and 24 percent of hospitalized children require PICU admission.

For more information about influenza, visit, or call CDC at 1-800-CDC-INFO (800-232-4636).

U.S. Department of Health and Human Services

CDC works 24/7 saving lives and protecting people from health threats to have a more secure nation.  Whether these threats are chronic or acute, manmade or natural, human error or deliberate attack, global or domestic, CDC is the U.S. health protection agency. 

SOURCE Centers for Disease Control and Prevention (CDC)

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