INCE APRIL 17, 2009, WHEN THE first 2 cases of pandemic influenza A(H1N1) virus infection were reported in California, the virus has rapidly spread throughout the world. 1 On June 11, 2009, the World Health Organization raised the pandemic alert level to phase 6, indicating that a global pandemic had begun. 2 Although initial reports suggested that illness associated with pandemic 2009 influenza A(H1N1) infection may be mild compared with the 1918 influenza pandemic, data on the clinical features and populations at risk of complications from pandemic 2009 influenza A(H1N1) infection are still emerging. In the United

Community-associated MRSA infections are now a common and serious problem. These infections usually involve the skin, especially among children, and hospitalization is common.

half of Californians ≥ 20 years of age hospitalized with 2009 H1N1 infection were obese. Extreme obesity was associated with increased odds of death. Obese adults with 2009 H1N1 infection should be treated promptly and considered in prioritization of vaccine and antiviral medications during shortages.

In this series of patients identified in California from June 2012 through July 2015, clinical manifestations indicated a rare but distinct syndrome of acute flaccid paralysis with evidence of spinal motor neuron involvement. The etiology remains undetermined, most patients were children and young adults, and motor weakness was prolonged.

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