mang gan nhu nguoi, sau khi so huu cac va dap nhe, phan mem o hc6an hay dui xuat se xuat hien cac vet tham, khi an vao ko dau. Hoac tren da noi cac mang xuat huyet (khong noi san hay ko voi tin hieu ngua tren be mat da). co nhung nguoi xuat huyet o 2 tay hoac lung co khap nguoi nhung so huu nguoi dien ta xuat huyet truoc nhat lai o chan. nhung tin hieu tren rat voi the benh ly cua benh nghiem tron