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Clase @', , Classification, , , , , , Disturbance in, structure and, function, , , , According to Duration or O, , 1, Acute Illness: Acute illness is characterized by severe, tion. The signs and symptoms appear abruptly, i, relatively short period. Following an acute illness, , : 4 person may return to normal leve!, 2, Chronic Iliness: Slow onset. Persi |, nic “ ersists, usually longer than 6 months and can also a, , any dimension. Chronically ill person have long term disease prec.