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Influenza Tests Infrequent and Under-recognized in Hospitalized Older Adults

by Anjali Aryamvally on January 21, 2018 at 8:03 AM
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Influenza Tests Infrequent and Under-recognized in Hospitalized Older Adults

Adults aged 65 years and older who are hospitalized with fever or respiratory symptoms during influenza seasons are less likely to have a provider-ordered influenza test than younger patients, shows new study published in the Journal of the American Geriatrics Society. This year's flu season is shaping up to be an especially serious one, and it's important for clinicians to promptly recognize, diagnosis, and treat influenza in hospitalized patients, especially in vulnerable populations such as older individuals.

The highest rates of hospitalization and death associated with influenza infections are experienced by older adults. To see if these individuals are being adequately tested for influenza by their doctors when they present with symptoms, Lauren Hartman, MD of the Vanderbilt University School of Medicine and her colleagues conducted a study that included 1422 adults hospitalized with symptoms of acute respiratory illness or non-localizing fever at four hospitals in Tennessee during the influenza seasons from November 2006 to April 2012.

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The researchers found that overall, 28 percent of participants had provider-ordered influenza testing. Patients who were tested were younger than those not tested (an average age of 58 years versus 66 years) and more likely to have influenza-like illness (71 percent versus 49 percent). Influenza-like illness decreased with increasing age: 63 percent for those 18-49 years, 60 percent for those 50-64 years, and 48 percent for those 65 years. Among all patients, presence of influenza-like illness and younger age were independent predictors of provider-ordered testing.

The investigators in the study conducted laboratory tests of influenza for all patients, regardless of whether their providers ordered testing. Among the 399 patients with influenza confirmed by these laboratory tests, influenza-like illness was the only significant predictor of provider-ordered testing. Nearly half of patients with confirmed influenza did not have testing ordered by their providers.
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"Influenza is a common cause of hospitalization in older adults, but it is often under-recognized. It is important that physicians consider influenza in hospitalized older adults because antiviral treatment is beneficial if given early, and so spread to other vulnerable patients can be prevented," said Dr. Hartman.



Source: Eurekalert
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