Missouri investigates more possible human-to-human H5N1 avian flu spread

Today the Centers for Disease Control and Prevention (CDC) said investigators in Missouri were looking into eight possible human infections of H5N1 avian flu virus after the state reported its first case last month. If confirmed, the cases would mark the first instance of human-to-human H5N1 transmission in the country. 

At least one household member and six healthcare workers who encountered the index case-patient are being investigated after showing symptoms of viral infection. A week ago, the CDC noted that only two healthcare workers who had contact with the Missouri patient had symptoms.

So far 14 human H5N1 cases have been reported in the United States this year, most all but one in agricultural workers who were in close contact with infected cattle. All patients have recovered, but the Missouri patient was hospitalized for his or her illness.