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Table 1 Populations and observed proportions affected in summer, autumn & winter waves in 1918-19 pandemic

From: Prior immunity helps to explain wave-like behaviour of pandemic influenza in 1918-9

Population N - - - S- - -A- - -W SA- S-W -AW SAW
South Shields 462 844.2 26.0 51.9 67.1 2.2 2.2 6.5 0
Leicester 4619 719.9 62.1 131.8 69.9 3.0 4.8 8.0 0.4
Wigan 1075 774.0 40.9 73.5 108.8 0 0 1.9 0.9
Newcastle 4461 814.4 52.5 46.6 73.1 0.4 8.7 3.8 0.4
Manchester 4686 747.1 130.8 83.7 15.6 14.3 5.5 2.3 0.6
Blackburn 1284 785.0 75.5 56.1 64.6 5.5 4.7 7.8 0.8
Widnes 3417 696.5 113.5 77.8 99.5 4.1 6.1 2.3 0
London police 746 749.3 61.7 144.8 32.2 5.4 0 6.7 0
Cambridge Uni 1766 457.0 206.7 208.4 73.6 18.7 9.6 21.5 4.5
Clifton College 451 232.8 153.0 84.3 188.5 20.0 157.4 135.3 28.8
Haileybury 515 302.9 227.2 93.2 205.8 60.2 42.7 48.5 19.4
Finchley School 1224 550.7 90.7 312.9 23.7 14.7 4.1 3.3 0
ALL 24706 703.1 96.5 105.0 67.5 8.1 9.3 8.9 1.6
  1. N = total number of persons surveyed in each population. - - -: proportion of persons (per 1000) not reporting symptoms in any wave; S - -: proportion reporting symptoms in summer wave only; SA-: proportion of persons reporting symptoms in the summer and autumn waves, but not in the winter wave. SAW: proportion reporting symptoms in all three waves, etc.