On April 1, 2013, the World Health Organization (WHO) reported three human cases of avian influenza H7N9 in China. These were the firstknown human infections with this avian strain ever reported. Since then, many new cases have been reported and additional cases are expected to occur. Several of the cases have been hospitalized with severe respiratory illness, although mild cases have now also been reported. H7N9 viruses have been detected in poultry in China in the same areas where human cases have been reported and many of the human cases have had poultry contact. So far, there is no evidence of ongoing human-human transmission. Investigations into the source of these infections are still ongoing. For the latest case count, see the WHO Avian Influenza Situation Updates.
There have been no H7N9 infections reported in birds or humans in the United States. Orange County continues to monitor the situation closely.
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