By Dominique Patton BEIJING (Reuters) – A jump in the number of people in China infected with bird flu this year is raising concern among experts, who say a previously circulating strain appears to have changed and may be more infectious to people. China has reported 21 human infections with the H5N6 subtype of avian influenza in 2021 to the World Health Organization (WHO), compared with only five last year, it said. Though the numbers are much lower than the hundreds infected with H7N9 in 2017, the infections are serious, leaving many critically ill, and at least six dead. “The increase in hu…

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