Page 67
EXAMINATION OF RATS.
The Tables IV and V below are compiled as in previous years. The total number of rats examined during 1910 was 56,001 compared with 61,367 during the year 1909.
Table IV.
Month. Total. Male. Female. Plague-infected. Pregnant. Poisoning. Phosphorus Newly born. January, 4,307 2,130 2,177 26 213 93 239 February, 8,386 1,648 1,738 20 170 1,057 204 March, 4,592 2,299 2,293 16 213 953 239 April, 4,742 2,358 2,384 17 249 887 283 May, 5,016 2,481 2,535 2 228 761 241 June, 4,775 2,103 2,672 199 703 228 July, 4,570 2,293 2,277 235 684 262 August, 4,473 2,248 2,225 6 197 602 151 September, 4,670 2,349 2,321 211 624 182 October, 5,650 2,853 2,807 3 235 713 126 November, 5,690 2,703 2,666 205 672 288 December, 4,441 2,354 2,087 186 638 255 Total, 56,001 27,869 27,802 107 2,542 9,229 2,653In addition one rat was sent from Amoy for diagnosis as to Plague infection—the result was negative.
Table V
January to December inclusive. Males examined. Males Plague-infected. Ratio per 1,000. Females examined. Females Plague-infected. Ratio per 1,000. M. Decumanus, 15,816 58 3.6 15,997 45 2.1 M. Rattus, 8,213 3,840 +3 7,888 3,917 1 M. Musculus, 3In connection with the rat examination for Plague, it was thought that it would be of some interest to examine the diaphragms of these rats for Trichina Spiralis, the rat being the normal or proper host of the Trichina. A microscope with a special slide for this purpose was kindly lent by Mr. Gibson, Colonial Veterinary Surgeon, and the diaphragms of some 1,865 rats were examined by Mr. Chan Tsun-Kon, the Bacteriological Assistant, all with a negative result. This is confirmatory of Mr. Gibson's examination of Pigs.
Page 67
L 67
EXAMINATION OF RATS.
The
Tables IV and V below are compiled as in previous years. total number of rats examined during 1910 was 56,001 compared with 61,367 during the year 1909.
Table IV.
Month.
Total.
Male. Female.
Plague-
infected.
Pregnants.
Poisoning.
Phosphorus
Newly
born.
Jaunary,
4,307
2,130
2,177 26 | 213 93. 239
February,
8,386 1,648
1,738 20
170
1,057
204
March,
4,592 2,299
2,293 16
213
953
239
April,
4,742
2,358
2.384 17
249
887
283
May,
5,016 2,481
2,535 2
228
761
241
June,.....
4,775 2.103
2,072
199
703
228
July,
4,570
2,293
2,277
235 684
262
August,
4,473
2,248
2,185
6
197 602
151
September,
4,670
2,349
2,321
211
624
182
October,
5,650
2,853
2,807 3
235
713
126
November,
5,69 2,703
2,666
205
672 288
December,.
4,441
2,354 2,347
186 638 255
Total,
56,001 27,869 27,802 107
2,542 9,2292,653
In addition one rat was sent from Amoy for diagnosis as to Plague infection-the result was negative.
Table V
December inclusive.
ex-
January to Males Males Ratio
Plague- per amined. infected. 1,000.
Females Females Ratio
CX- Plague- per amined. infected.
1,000.
M. Decumanus,.. 15,816 58 M. Rattus,
3 M. Musculus,
3.6
8.213 3,840
+3
15,997 45
7,888 3,917
2.1
1
In connection with the rat examination for Plague, it was thought that it would be of some interest to examine the diaphragms of these rats for Trichina Spiralis, the rat being the normal or proper host of the Trichina. A microscope with a special slide for this purpose was kindly lent by Mr. Gibson, Colonial Veterinary Surgeon, and the diaphragms of some 1,865 rats were examined by Mr. Chan Tsun-Kon, the Bacteriological Assistant, all with a negative result. This is confirmatory of Mr. Gibson's examination of Pigs.
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