(added on 2010/02/23)
The first wave is gone 再見第一波
In Hong Kong, the first case of swine flu (Pandemic human influenza A (H1N1)) was reported on 1 May 2009. The first wave of the epidemic peaked between the third and fourth quarter of the year 2009. This map illustrates the cumulative number of reported cases by DCCA (District Council Constituency Area) in the five month period between May and September. The monthly numbers are shown in a bar chart for each of the 18 districts. The number has risen from less than 10 in some districts in May to over 1000 in September. The spread has not been an even one on a spatial scale. As regular testing and reporting of swine flu stopped after September 2009, subsequent spread cannot be plotted in time and space. Government laboratory surveillance data suggested that the proportion of influenza cases tested positive for swine flu has fallen from >70% in September to below 20% in November 2009. Influenza-like illness surveillance reported low activities in the subsequent months and has remained low by January 2010. So, we have finally said goodbye to the first wave! This map was constructed from data obtained from Centre for Health Protection, Hong Kong Government Department of Health.