Blood tests confirm a second person in Missouri caught bird flu without exposure to infected animal, but questions remain CNNAs Bird Flu Spreads, Additional Human Infection Is Reported in Missouri The New York TimesCDC testing suggests Missouri did not see a cluster of bird flu cases STATSome Bright Spots on Bird Flu, Even as Case Counts Grow Barron’sCDC Says To Date, Human-To-Human Spread Of H5 Bird Flu Has Not Been Identified In US XM