Story maps
故事地圖

The globe can be divided into 18 geographic zones, each of which shares similar influenza transmission patterns. The map shows the level of influenza activity and the distribution of circulating strains?of?influenza virus by influenza transmission zone, based on sampling data obtained in the first four weeks of 2015.

As depicted by graduated colours, raised influenza activity was observed in most regions in the northern hemisphere, while influenza activity in the southern hemisphere remained at inter-seasonal levels. During the first four weeks of 2015, decreasing number of specimens positive for influenza in North America and Eastern Asia was observed, reflecting that influenza activity might have peaked in these two regions. However, influenza activity continued to rise in Europe and Western Asia.? As shown by pie charts, influenza A (H3) was the dominant virus circulating in the northern hemisphere in this influenza season.

Data for the map were obtained from World Health Organization.

根據各地的流感病毒傳播模式，全球約可分為十八個流感散播區域。地圖以2015年首四週的流感病毒樣本數據，顯示各流感散播區域的流感活躍程度及其病毒亞型分佈。

依圖中顏色所示，北半球大部分地區的流感活躍程度均處於高水平，相反南半球各地區則處於流感季間水平。於2015年首四週，北美及東亞地區的陽性流感樣本數目有所下降，顯示該地區的流感活躍程度或已達至高峰，但同一時間，歐洲及西亞地區的流感活躍程度卻仍持續上升。依圖中圓形圖所示，是次北半球流感季節的主要流行病毒為甲型（H3）流感。

地圖資料源自世界衛生組織。