An increase in the number of people in China infected with bird flu this year is raising concern among experts. They say an earlier bird flu strain appears to have changed and may be more infectious to people. The World Health Organization (WHO) says China has reported 21 human infections with the H5N6 strain of bird flu in 2021. That compares with only five reported cases … [Read more...] about Rise in Bird Flu Infections Show Risks of Fast-Changing Variants