Influenza : $b An epidemiologic studyVaughan, Warren T. (Warren Taylor)
History
Influenza : $b An epidemiologic study
Vaughan, Warren T. (Warren Taylor)
Influenza
Moreover, in some localities there were during this interval small
epidemic outbreaks. Thus a report from Lisbon, Portugal, on June 1,
1919, states that the deaths from influenza in that city during the
preceding two weeks had been more than the total deaths from all causes
during the preceding four months. A report from London, October 30,
1919, states that during the preceding few weeks there had been in the
ninety-six great towns of England and Wales a slight but gradual
increase in the number of deaths attributed to the disease, and a
coincident rise in the number of notifications of acute primary and
acute influenzal pneumonia. The feeling at that time was that the
increase was associated with prevailing meteorological conditions, and
did not apparently signify more than the usual variation in respiratory
diseases which was to be expected at that season of the year. On
November 3, 1919, the disease was reported prevailing at Chile and it
was spreading throughout Bolivia. At the same time influenza had spread
over the entire country surrounding Buenos Ayres and had even reached
the neighboring city of Montevideo. In the latter part of November more
than 2,000 cases had been reported at Lemaies, about fifteen miles
northeast of Granada, Spain.
_The winter of 1920._—In the United States the death rates from
influenza and pneumonia in the large cities over the entire country were
below the usual average from May, 1919, until January 1, 1920. In the
week ending January 17th there was a sharp increase in the
influenza-pneumonia rate, which occurred simultaneously in Kansas City
and Chicago. In the latter city an excess over the average was not
reached until some days later, but the maximum mortality occurred in the
week ending January 31st, while in Kansas City the mortality did not
reach its height until one week later. New York, Washington, San
Francisco, Milwaukee and St. Paul soon followed with an increase in the
week ending January 24th, and in the subsequent two weeks many other
cities were added to the list. By February 14th thirty-two out of the
thirty-six large cities reporting had an increase in the death rate from
influenza and pneumonia as compared with the same period in 1917. The
maximum was reached at this time, and according to the Bureau of the
Census reports there were 7,059 deaths from influenza and pneumonia
during the week ending February 14th. In the next week the number of
deaths from these causes in the cities reporting had dropped to 5,088.
The February weekly average for 1917 was 1,489. In the week ending
February 14th, 267,643 cases of influenza were reported from forty-one
states; the excess annual death rate as compared with the average for
the period from 1910 to 1916 was 1,319.
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