【明報專訊】27cases of pneumonia of unknown causes have been reported in Wuhan. This has brought back many Hongkongers' memories of the SARS epidemic. It is the right thing to do for the government and the public to heighten alertness and take precautionary measures that are reasonable and appropriate. The Hong Kong government should keep a close watch on the situation, communicate with the mainland authorities closely and do a good job of essential epidemic prevention.