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co phan nhieu nguoi, sau khi so huu cac va dap nhe, phan mem o hc6an hay dui xuat se xuat hien nhung vet tham, khi an vao khong dau. Hoac tren da noi nhung mang xuat huyet (khong noi san hay khong so huu dau hieu ngua tren be mat da). so huu cac nguoi xuat huyet o hai tay hoac lung co khap nguoi nhung so huu nguoi the hien xuat huyet dau tien lai o chan. cac dau hieu tren rat mang the benh ly cua