戴口罩是预防甲型H1N1流感的一项有效措施,尤其是出入人员密集、空气不畅的场所或医院,戴上口罩可有效降低患病的风险。然而不同类型口罩过滤效果存在很大差异,为此,药监部门提醒,选购恰当的口罩能 Wear masks to prevent influenza A H1N1 influenza is an effective measure, especially in the densely populated, poor air places or hospitals, wearing a mask can effectively reduce the risk of illness. However, different types of masks filter effect there is a big difference, therefore, drug regulatory department reminded, choose the right mask