Abstract
Abstract In China during March 4–April 28, 2013, avian influenza A(H7N9) virus testing was performed on 20,739 specimens from patients with influenza-like illness in 10 provinces with confirmed human cases: 6 (0.03%) were positive, and increased numbers of unsubtypeable influenza-positive specimens were not seen. Careful monitoring and rapid characterization of influenza A(H7N9) and other influenza viruses remain critical.
Highlights
As of April 28, 2013, a total of 125 cases of avian influenza A(H7N9) virus infection and 24 related deaths were confirmed in humans in 8 provinces and 2 municipalities of mainland China (1)
After the avian influenza A(H7N9) virus outbreak was identified in China, Chinese National Influenza-Like Illness Surveillance Network (CNISN) increased sampling and testing of influenza-like illness (ILI) case-patients
As a result of this testing, CNISN identified 6 influenza A(H7N9) virus–positive specimens in 5 provinces that were already known to have cases. These data demonstrate that avian influenza A(H7N9) virus is an uncommon cause of ILI in any age group and in the areas reporting confirmed cases of influenza A(H7N9) infection
Summary
As of April 28, 2013, a total of 125 cases of avian influenza A(H7N9) virus infection and 24 related deaths were confirmed in humans in 8 provinces and 2 municipalities (hereafter called affected provinces/municipalities) of mainland China (1). In the affected provinces/municipalities, the number of specimens tested increased from a mean of 2,643 during the week starting April 1 to a peak of 3,259 during the week starting April 9; the increase was highest among persons [15–24] and [25–59] years of age (online Technical Appendix Figure 2). During the same period, the proportion of specimens positive for influenza decreased in the affected provinces/municipalities.
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