The Health Commission of Guangdong Province, South China, ad this Thursday the existence of a new case of infection of the H5N6 strain of bird flu in humans. The new case occurred in the city of Dongguan, in a context in which the increase in people infected with bird flu in China during 2021 is generating concern among experts, who explain that the current situation is probably given by the mutation of a strain that has become much more infectious to humans than its predecessors.During the current year, China has reported 21 cases of human infections with the H5N6 subtype...