| http://www.w3.org/ns/prov#value | - time, researchers said the H7N9 strain appeared to have undergone some kind of mutation and had become infectious to humans.The expert at the CDC therefore believes that there could be another source of infection other than birds, such as mammals.Whether those mammals are cats, pigs or other animals is something that is still being investigated by experts.Since both the Taiwanese and Chinese media
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