Compared with a few decades ago, Hong Kong people nowadays suffer less from infectious diseases due to improvement in socio-economic status and hygienic conditions. However, infectious disease prevention and control are still very important since outbreaks can happen at anytime and new infectious agents emerge from time to time. In Hong Kong, there are currently a total of 50 notifiable infectious diseases. In 2017, the top three most commonly reported infectious diseases were Chickenpox, Tuberculosis and Scarlet fever. For monthly statistics on notifiable infectious diseases, please click here.