Hints from the Health Department. Leaflet from the archive of the Society of Medical Officers of Health. Credit: Wellcome Collection, London
[Report of the Medical Officer of Health for London County Council]
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T able IB —
| Immunised in the month of | No. at risk | 1949 | 1950 | Total | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Jan. | Feb. | Mar. | April | May | June | July | Aug. | Sept. | Oct. | Nov. | Dec. | Jan. | Feb. | Mar. | Observed | Expected | |||
| January | 711 | — | — | — | — | — | |||||||||||||
| February | 718 | — | — | — | — | — | |||||||||||||
| March | 1,790 | — | — | 1 | — | 1 | |||||||||||||
| April | 1,708 | — | — | — | — | — | |||||||||||||
| May | 2,030 | — | — | — | — | — | |||||||||||||
| June | 1,714 | — | 2 | 1 | — | 3 | |||||||||||||
| July .. .. | 2,044 | 2 | 2 | 2 | 1 | 7 | |||||||||||||
| August | 2,017 | 3 | 8 | 1 | — | 12 | |||||||||||||
| September | 2,224 | 8 | 3 | — | — | 11 | |||||||||||||
| October | 707 | 3 | — | — | — | 3 | |||||||||||||
| November | 517 | — | — | — | — | — | |||||||||||||
| December | 290 | ||||||||||||||||||
| Total diagonals observed | 37 | ||||||||||||||||||
| 16 | 15 | 1 | |||||||||||||||||
Figures in italics are the expected cases calculated from the not inoculated group, see text.