Flu Scan for May 05, 2015

H7N9 case in China
Hospital influenza diagnosis

Anhui province reports China's 2nd H7N9 case this month

A new case of H7N9 avian flu has been reported from China, this one in a 3-year-old boy from Huaibei City, according to machine-translated notices from provincial health officials posted yesterday on FluTrackers, an infectious disease message board.

The child, who is reportedly in stable condition with mild symptoms, had contact with live poultry before his Apr 27 disease onset. He received outpatient treatment.

Huaibei is in northern Anhui province, which lies in east-central China. The new case is the second reported in the country so far in May.

The global total for H7N9 cases stands at 660, according to a case list maintained by FluTrackers. Cases have slowed considerably since the beginning of 2015, and experts claim the third wave of H7N9 may be over.
May 4 FluTrackers thread
FluTrackers H7N9 case list
May 1 CIDRAP News scan regarding slowing of cases


Study: Influenza overshadowed by bacterial diseases in clinical diagnosis

Influenza is diagnosed clinically in only 29% of patients with laboratory-confirmed flu in medical setting, with bacterial diseases apparently given preferential consideration, say findings of a study published yesterday in the Journal of Infectious Diseases.

The authors, from Wake Forest School of Medicine, evaluated 504 case-patients who were admitted to the hospital or seen in the emergency department with fever or respiratory symptoms from 2009 to 2013 and were later confirmed as having influenza on the basis of viral culture and/or polymerase chain reaction testing.

Influenza was the clinical diagnosis in only 29% of the group, including 56% of the 236 with high-risk conditions. A clinical diagnosis of influenza was defined as a discharge diagnosis of flu, a prescription for a neuraminidase inhibitor, or a positive rapid flu test.

Predictors of flu on clinical diagnosis included race/ethnicity, insurance status, year, being hospitalized, having high-risk conditions, and not having a bacterial diagnosis. The authors conclude, "Being diagnosed with a bacterial infection reduced the odds of an influenza diagnosis over 3-fold for all patients and for patients with high risk conditions."
May 4 J Infect Dis abstract

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