Story maps

(updated on 2011/04/04)

The second wave (updated) 第二波 (更新)

Data source: media reports and
Map created by Candy Wong and CUHK SpatioEpi Group

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In 2009, swine flu was the dominant virus in influenza epide mics around the world, the causative virus if which is now commonly referred as Influenza A (H1N1)2009. In Hong Kong the epidemic peaked in September 2009, leaving people to guess when the second wave would arrive. Swine flu did not come back in the following two influenza seasons in 2010. Outbreaks however began to occur in late January 2011. The map shows the locations of school outbreaks of influenza-like illness (red circles) in the 10-week period from the last week of January 2011, against the distribution of student cases (age 5-19) reported during the 2009 epidemic in the background (grey to black in colour). Interestingly most of these were located in DCCA (District Council Constituency Areas) where a lower number of cases were reported in 2009. It is likely that H1N1 transmission in this second wave took place more readily in geographic areas less affected in the previous epidemic. A higher number of reported cases in the past then could well mean that more students have become immune before the second wave arrived. Data for the map were obtained from the daily update reports of Centre for Health Protection ( in Hong Kong.

2009年豬流感病毒在全球各地擴散,病毒及後被確認為『人類甲型流感病毒H1N1 2009』。香港的豬流感爆發疫情,在2009年9月達最高峰。當眾人猜度第二波何時重臨之際,病毒彷佛在2010年的兩個流感季節中銷聲匿跡。到了2011年1月下旬,豬流感終於再次再度爆發。地圖顯示2011年1月最後一周起的十星期,出現流感樣(指流感徵狀)爆發個案學校地點分佈(紅圈),並以2009年學生(年齡5至19歲)豬流感報告數為背景(灰至黑色)。有趣地,2011年學校流感樣爆發點,大都落在2009年較少受豬流感影響的區議會選區。從第二波的地點看來,當年居於重災區的學生似乎已因感染而免疫。地圖數據源自香港衛生防護中心每日更新的的疫情通告