M 118
The work of the staff is as usual highly satisfactory.
A. PROTOZOOLOGY AND HELMINTHOLOGY.
(1) Blood films for malaria.-Eight thousand four hundred and eighty-one films were examined for the presence of malarial parasites. Of this total four thousand and ninety-two were positive-roughly about half. It seemed of interest to determine the exact type distribution of these infections month by month in order to see how great an influence is exerted by season on the prevailing type. In examining the table no particular statistical value should be attached to the actual totals from month to month but only to the percentage relation of the different types to one another in the same month, and the relative percentage of types contrasted with other months. It is highly interesting to note the incidence of quartan infection. An abrupt rise occurs in the month of January and the rise steepens to a maximum of 53% of all infections in March; thereafter there is a gradual fall through April and May until June, in which month the fall is more rapid, to drop still more abruptly in July to 2.88%, which appears to be practically the basic rate which prevails for the rest of the year. It is thus essentially an infection of our winter months. Coinciding with the peak of the incidence of quartan in March we find a remarkable drop in the incidence of sub-tertian infection to 9.85%, to go still lower in April to 4.22%. This drop is the more striking when it is observed that the average comparative incidence of sub-tertian for the whole year is 52.41%.
The curve of incidence of simple tertian infection is more smooth than either quartan or sub-tertian.
Month Simple tertian Sub-tertian Quartan Total January 28.25% (19) 55.22% (37) 16.41% (11) 67 February 27.14% (19) 34.28% (24) 38.57% (27) 70 March 36.61% (26) 9.85% (7) 53.52% (38) 71 April 42.25% (30) 4.22% (3) 53.52% (38) 71 May 44.00% (33) 29.33% (22) 26.66% (20) 75 June 61.66% (74) 25.83% (31) 12.50% (15) 120 July 52.17% (180) 44.92% (155) 2.88% (10) 345 August 40.12% (126) 56.05% (176) 3.82% (12) 314 September 38.13% (233) 57.44% (351) 4.41% (27) 611 October 35.78% (384) 60.57% (650) 3.63% (39) 1,073 November 38.97% (288) 57.23% (423) 3.78% (28) 739 December Total cases 1,679 2,145 268 4,092- M 118
The work of the staff is as usual highly satisfactory.
A. PROTOZOOLOGY AND HELMINTHOLOGY.
(1) Blood films for malaria.-Eight thousand four hundred and eighty-one films were examined for the presence of malarial parasites. Of this total four thousand and ninety-two were positive-roughly about half. It seemed of interest to determine the exact type distribution of these infections month by month in order to see how great an influence is exerted by season on the prevailing type. In examining the table no particular statistical value should be attached to the actual totals from month to month but only to the percentage relation of the different types to one another in the same month, and the relative percentage of types contrasted with other months. It is highly interesting to note the incidence of quartan infection. An abrupt rise occurs in the month of January and the rise steepens to a maximum of 53% of all infections in March; thereafter there is a gradual fall through April and May until June, in which month the fall is more rapid, to drop still more abruptly in July to 2.88%, which appears to be practically the basic rate which prevails for the rest of the year. It is thus essentially an infection of our winter months. Coinciding with the peak of the incidence of quartan in March We find a remarkable drop in the incidence of sub-tertian infection to 9.85%, to go still lower in April to 4.22%. This drop is the more striking when it is observed that the average comparative incidence of sub-tertian for the whole year is 52.41%.
The curve of incidence of simple tertian infection is more smooth than either quartan or sub-tertian.
Simple tertian
Month.
Sub-tertian Quartan
Total
January
February
March
April
28.25% (19) 55.22%
27.14% (19) 34.28%
36.61% (26) 9.85% 53.52% (38) 4.22%
May
44.00% (33) 29.33%
(37) 16.41% (11)
(24) 38.57% (27)
(7) 53.52% (38) (3) 42.25% (22) 26.66%
67
70
71
2 29
(30)|
71
(20)
75
June
61.66% (74) 25.83% (31) 12.50%
(15)
120
July
August
September
October
November
December
52.17% (180) 44.92% (155) 2.88% (10) 48.32% (259) 49.62% (266) 2.05% (11)
40.12% (126) 56.05% (176) 3.82% (12)
38.13% (233) 57.44% (351) 4.41% (27)
35.78% (384) 60.57% (650) 3.63% (39)
38.97% (288) 57.23% (423) 3.78% (28)
345
536
314
611
1,073
739
Total cases
1,679
2,145
268
4,092
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