618
The epizootic with exacerbations continued to the end of the year. plague was practically absent.
Conclusions drawn from District No. 5.—
Human
1. The primary severe epizootic was followed by a severe outbreak of the
epidemic.
2. The epidemic reached its maximum after a fall in the numbers of the
epizootic.
3. Little or no relation appears to exist between human plague and the
continuance, with acute outbreaks, of the epizootic.
The History of Health District No. 6 in 1902.-Rat plague appeared on the 8th of April.
.
The epidemic followed a fortnight later. The courses of the epizootic and epidemic are somewhat similar to that found in Health District No. 5.
In the middle of May the epizootic reached its highest point.
At the beginning of June, a smart rise of the epidemic was found. During the first week of July a sudden rise of the epidemic took place, and this was followed by a rise in the epizootic which was prolonged for several weeks. The condition of affairs is representative of what is usually found, and com- pares favourably with the charts illustrating the sequence of events in other districts. Noteworthy is the continuance of rat plague until the end of the year. Possible explanation of this rise of the epizootic is given under a separate heading.
The History of Health District No. 7 in 1902.-The epizootic was present on the 8th of April. The epidemic started a fortnight later. The highest point in the epizootic was reached about the middle of the month of May. The highest point in the epidemic was reached about the first week in the month of June, ¿.e., about a fortnight later.
A regular rise and fall of the epizootic and the epidemic took place throughout. In general a rise in rat plague was followed by a rise in human plague about ten days to a fortnight later. A point of note in connection with the epizootic is the repeated acute recrudescence of the disease. In this chart, as well as in many others, one finds two main recrudescences of the epizootic during the prevalence of the epidemic. Sudden outbursts of the epizootic without the advent of human plague are found. as in other districts, towards the end of the year.
The History of Health District No. 8 in 1902.-The epizootic was pres nt on the 8th of April, but remained in abeyance until about the end of the month..
During the week ending the 29th April. there was a sudden advent of rat plague. This was followed a week later by the appearance of the epidemic. During the week ending the 6th May, the epizootic reached its maximum height. From this date onwards with various depressions and exacerbations, the epizootic curve slowly fell, coming more or less suddenly to an end about the middle of September.
Human plague evidenced itself during the greater part of the period of the epizootic. It began a week later, had exacerbations and depressions more or less similar to those found in the epizootic, and it finished a fortnight previous to rat plague. The more minute details in regard to the two curves compare favourably with those already given under other districts.
Conclusions drawn from this District.—
1. The epizootic is sudden in advent.
2. The epidemic is more gradual in onsets.
3. The epizootic begins one week earlier and finishes a fortnight later
than the epidemic.
The History of Health District No. 9 in 1902.—So far as the relations exist- ing between the epizootic and the epidemic, this district is of the greatest importance.