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Class suspension for interrupting influenza transmission 停課避流感

(added on 2019/02/01)

©2019 SpatioEpi.com
Data source: Centre for Health Protection, Hospital Authority, Education Bureau and Social Welfare Department
Map created by CUHK SpatioEpi Group

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Since December 2018, influenza activity in Hong Kong has been rising with influenza A(H1) as the dominating virus. Children aged under 6 years were specially affected in this 2018-19 winter influenza season. The map shows the impact of 2018/19 seasonal influenza on kindergartens and/or child care centres, as well as paediatric wards in public hospitals.

Since the start of the 2018/19 winter influenza season, a total of 389 kindergartens/ children care centres had classes suspended in response to institutional outbreaks. As shown by the graduated colours, almost half of the kindergartens/ children care centres in Shatin, Tsuen Wan and North District required class suspension by 25 January 2019, compared to that of less than 30% in Wong Tai Sin and Eastern District. The spatial difference in the influenza activity is also be reflected by the more highly occupied inpatient paediatric wards in the public hospitals neighbouring areas where a higher proportion of kindergartens/children care centres had closed, as indicated by the red cross symbols. As announced by the Hong Kong Government, all kindergartens/ children care centres were required to close from 26 January onward, implying an early start of the Lunar New Year holidays.

Data for the map were obtained from Centre for Health Protection, Hospital Authority, Education Bureau and Social Welfare Department.

自2018年12月起,香港的流感活躍程度持續上升,當中主要流行的病毒為甲型(H1)流感。2018/19年度的冬季流感季節中,六歲以下兒童是特別受影響的群組。地圖顯示2018/19季節性流感對幼稚園或幼兒中心及公立醫院兒科病房的影響。

從2018/19年度的冬季流感季節開始,共有389間幼稚園或幼兒中心因流感疫情而需要暫時停課。依圖中顏色所示,近一半位於沙田、荃灣及北區的幼稚園或幼兒中心已於1月25日或之前停課,但東區及黃大仙區的停課比率則少於百分之三十。此地區差異亦從公立醫院兒科住院病床佔用率反映出來,依圖中紅色十字圖案所示,兒科病床佔用率較高的醫院多數鄰近於幼稚園或幼兒中心停課比率較高的地區。因應流感持續活躍,政府宣布全港所有幼稚園及幼兒中心於2019年1月26日起提早放農曆新年假期。

地圖資料源自香港衛生防護中心、醫院管理局、教育局及社會福利署。

Related Article

Human influenza 人類流感

Influenza is a respiratory infection caused by the influenza virus, different forms of which are normally circulating in not just human beings but pigs and birds. All influenza viruses are divided into A, B and C, and further distinguished by their H and N antigens. There are currently 18 H (standing for haemagglutinin) and 11 N (standing for neuraminidase) antigens. Epidemics occurred when novel viruses are introduced to the human population. Pandemic influenza A (H1N1), previously referred as Swine flu, was an example causing worldwide outbreaks in 2009. The genetic structure of this influenza virus contains segments from pig, bird and human, reflecting the occurrence of reassortment. Studies suggested a case fatality rate of 0.4% for the novel infection, and a higher tendency for causing disease in young people compared to other forms of seasonal flu. Since 2009, the same virus has continued to cause outbreaks in different populations at different timepoints.

流感是指『流感病毒』引起的呼吸道傳染病,所影響的不單是人,也包括豬和禽鳥。『流感病毒』分甲、乙、丙三個主要類型,又以H(血凝素)和N(神經氨酸酶)基因作更仔細的分類,而現時已知的共有十八種H和十一種N基因。新類型流感病毒的出現,往往為人群帶來大爆發。二零零九年新發現的人類甲型H1N1流感病毒,初時被稱為豬流感。該病毒包含了人、豬和禽鳥的流感病毒基因,反映了基因重組現象。研究顯示,該流感的死亡率約百份之零點四。而相對於其他季節性流感,H1N1對年青人的致病機會相對較高。自2009年起,人類甲型H1N1流感病毒繼續在不同地點和時間在人群中爆發。


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