Figure 6.2 Spanish influenza, 1918–19. (A) Weekly influenza death rate per 100,000 population, London and the county boroughs of England and Wales, June 1918–April 1919. The three wave form of the pandemic is clear. The global diffusion of the first two waves is mapped in (B) and (C). (B) Wave I, spring and early summer 1918. (C) Wave II, Autumn 1918.