U.S. health officials are investigating whether a Missouri person infected with H5N1 bird flu transmitted the virus to others. The CDC has developed a new test to check for antibodies in health workers and a household contact of the patient. Genetic changes in the virus require this new test, causing a delay in results expected by mid-October. The mutation in the virus may affect vaccine effectiveness and serology tests. Concerns about human-to-human transmission exist, but experts caution against premature conclusions. The CDC continues to monitor flu activity in Missouri, but so far, there have been no signs of unusual flu activity.
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CDC testing of Missouri’s bird flu case hits obstacles, delaying answers
