Dấu hiệu tố bạn có hệ miễn dịch kém
Cập nhật: 11:08 13/06/2016 GMT+7
Hệ miễn dịch bảo vệ cơ thể khỏi các nhiễm trùng và nhiễm độc như vi-rút, vi khuẩn, nấm và kí sinh trùng mà chúng ta tiếp xúc hàng ngày trong môi trường.
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