Why Is Bird Flu Spreading In People In The US? Antibody Tests Have the Answer, Experts Say

The spread of the H5N1 bird flu virus across 14 states in the US has baffled health experts, who are waiting for a few tests to have a clear picture of how human-to-human transmission of the virus has happened. Apart from 254 herds of dairy cows, 16 people have so far been infected with the avian influenza, since the outbreak happened in March this year. Read on to know what experts think.