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Table 4 The peak period of avian influenza A (H7N9) in humans in 2013–17

From: Spatial and temporal clusters of avian influenza a (H7N9) virus in humans across five epidemics in mainland China: an epidemiological study of laboratory-confirmed cases

year Number of cases r Peak date Peak period
2013 145 0.840* 19 March 13 February~ 22 April
2014 314 0.779* 6 February 27 December~ 19 March
2015 208 0.743* 11 February 29 December~ 29 March
2016 130 0.554* 26 February 25 December~ 30 April
2017 756 0.700* 27 February 9 January~ 16 April
Total 1553 0.688* 25 February 5 January~ 16 April
  1. “*” showed mean angles were statistically significant, P < 0.05