Figure 1.

Three waves of the 1918–1919 influenza pandemic, Breslau, June 1918–December 1922

Note: Three pandemic waves were observed in many locales in 1918–1919, as in these data from Breslau, Silesia (now Wroclaw, Poland), documenting monthly influenza mortality from June 1918 through December 1922. The figure is reproduced from data of Lubinski,^a upon which we have superimposed indications of the three 1918–1919 “waves” (W1, W2, and W3) and the first three annual winter post-pandemic recurrences, of 1919–1920 (R1), 1920–1921 (R2), and 1921–1922 (R3).

Source: Lubinski H. Statistische Betrachtungen zur Grippepandemie in Breslau 1918-22. Zentralblatt fur Bakteriologie, Parasitenkunde und Infektionskrankheiten 1923–1924;91:372-83.