H.—3l.

The accompanying maps show the incidence of paralytic cases by months, one set referring to the first phase (December, 1936, to March, 1937) and the other to the second phase (April-July, 1937). As the density of population varies markedly in different districts, a table is appended showing the paralytic cases by month of occurrence in each county, and in municipalities with a population of 2,000 and over, with the population of each area.

Table 6.—Acute Poliomyelitis (December, 1936, to November, 1937): All Cases, by Health Districts and Week of Notification.

83

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