Using the 2009 pandemic influenza, results of evaluation are shown (Fig. 2) . Except the pattern of 'ILI' (Fig. 2C ), other curves, using our easily understood definitions, show similar increase trend in week 34 with the gold standard (NNRS) ( Fig. 2A) , the first outbreak signal NNRS had detected. With CUSUM, case numbers did increase in week 34Á35 and fell out thresholds in week 35Á38, except 'Fever'Cough'.