WHO cảnh báo về sự biến thể của virus cúm gia cầm
Theo WHO, một loạt các trường hợp mắc cúm gia cầm ở người trong cùng gia đình và trong các nhân viên y tế ở VN có thể cho thấy virus này đang biến đổi thành một dạng có thể lây từ người sang người
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