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Rapid Flu Test Most Accurate for Young Kids
Date:2/15/2010

susceptible to flu complications.

"Especially for high-risk children, such as those with other illnesses such as asthma, who present with flu-like symptoms, you should consider treating them despite the results of a rapid test," Cruz said.

While reported cases of H1N1 influenza in the United States have dropped recently, the rapid-test study results "may help guide clinical decision-making when that third wave comes," Cruz said.

The latest report from the U.S Centers for Disease Control and Prevention said no state reported widespread flu activity, but six states were seeing regional activity and 10 states reported local activity.

The study results might not apply to all FDA-approved rapid diagnostic tests, Cruz said. "When you look overall at their sensitivity for seasonal flu, it varies between 50 and 95 percent," Cruz said. "It depends on what kind of test you are using versus what kind of patient you are testing."

The advantage of the rapid test is its availability, she said. "It's relatively simple. You don't require a skilled technician," she added.

"It's known that these are not perfect tests," said Dr. Nathan Litman, a professor of pediatrics at Albert Einstein School of Medicine and chief of pediatric infectious diseases at Montefiore Medical Center in New York City. "The thing about them is that they can rapidly identify about half of patients with influenza early on in the emergency room. But if this test is negative, there is still a chance they have influenza."

In practice, emergency patients suspected of having flu are started on drug therapy at Montefiore while a definitive laboratory test is done, Litman said. A final treatment decision is made after results of that test are available, which takes eight to 10 hours, he said.

More information

For the full H1N1 flu story, see the

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