TABLE 84.-The geographical distribution of measles, in Michigan, in the twelve years, 1893-1904, as indicated by the average numbers of cases and deaths, and the average deaths per 100,000 persons living, in each geographical division shown in the table.

*This footnote is below Table 82, on a preceding page.

*This footnote is below Table 82, on a preceding page.

THE SEASONAL PREVALENCE OF MEASLES.

Table 85 shows that, in Michigan, measles is most prevalent in the month of May and least prevalent in September. The greatest prevalence occurs in the months of February to June, both inclusive.

TABLE 85.—The seasonal prevalence of measles as indicated by the average numbers o persons taken sick in each month in the eight years, 1897-1904.

Months.

Jan. Feb. Mar. April. May. June. July. Aug. Sept. Oct. Nov. Dec.

Average number of cases taken sick 853 1,056 1,382 1,515 1,675 1,252 483 171 130 277 417 631

REPORTED SOURCES OF CONTAGIUM IN MEASLES.

Table 86 shows that the source of the contagium in measles is given in but 31 per cent of the cases reported. Of this number nearly all are reported as due to direct infection, and a very small proportion to infected houses, articles, etc.

About 18 per cent of the cases of measles which are traced to their source are due to the movement from one locality to another of persons infected with or who have been exposed to the disease.

TABLE 86.-The reported sources of contagium in measles, in Michigan, in the thirteen years, 1892-1904.

*In each year, many cases in this group belonged to outbreaks which began in a preceding year, and the source of contagium may have been traced and reported when the outbreaks first began.

THE INFLUENCE OF AGE AND SEX IN MEASLES.

Table 87 indicates that the greatest number of persons sick with measles are between the ages of 4 and 10 years; the next greatest number under 5 years of age, and the next greatest number between the ages of 9 and 15 years. Practically all the cases occur before the age of manhood, and from middle life to old age there is but little more than 1 per cent of the total cases in which the age is given.

At the early ages the males are slightly more susceptible to measles than are the females, but after the twenty-fifth year the susceptibility is slightly greater among the females.

Of the fatal cases, in

the 11 years, 1893-1903, 64 per cent of those who died from measles were under five years of age, and 76 per cent were under 10 years of age. As a rule, the fatality decreased with each increase in age, and was slightly greater among the females.

TABLE 87.-The influence of age and sex in measles, as indicated by the numbers of those who recovered or died from this disease, in the eleven years, 1893–1903. Arranged, by sex, in age groups of five years each.

All ages....

26,568 26,289 52,857 50.13 49.97 100.0 466 508 974 47.9 52.1 100.0

THE DURATION OF SICKNESS IN MEASLES.

Table 88 indicates that, as a rule, the sickness from measles lasts from 6 to 15 days, the greatest number of cases terminating between the eleventh and fifteenth days.

Of the fatal cases, the greatest number of cases terminated between the fifth and eleventh days, the next greatest number between the first and sixth days, and the next, and much smaller number, between the tenth and sixteenth days. Practically all the cases died before the sixteenth day.

TABLE 88.-The duration of sickness in non-fatal and fatal cases of measles, in the twelve years, 1892-1903.

RESTRICTIVE AND PREVENTIVE MEASURES IN MEASLES.

Table 89 indicates that, in 1904, in but 3 per cent of all the outbreaks of measles were the restrictive and preventive measures of isolation and disinfection both enforced.

TABLE 89.-Isolation of sick persons, and disinfection of infected premises, in outbreaks of measles, in Michigan, in 1904.

*There were 34 outbreaks which began in a preceding year, or were continued into 1905, which cannot be included in this table, because the extent of the restrictive measures is not definitely known.