Volume 24, Number 2—February 2018
Dispatch
Effects of Culling on Leptospira interrogans Carriage by Rats
Michael J. Lee
, Kaylee A. Byers, Christina M. Donovan, Julie J. Bidulka, Craig Stephen, David M. Patrick, and Chelsea G. Himsworth
, Kaylee A. Byers, Christina M. Donovan, Julie J. Bidulka, Craig Stephen, David M. Patrick, and Chelsea G. Himsworth
Table 1
Distributions of covariates by rat-trapping period and Leptospira interrogans real-time PCR status, Vancouver, British Columbia, Canada, June 2016–January 2017*
| Covariate |
Total |
PCR status before intervention |
PCR status after intervention |
|||
| Negative |
Positive |
Negative |
Positive |
|||
| Total |
430 |
226 |
39 |
140 |
25 |
|
| Season, no. (%) | ||||||
| Summer, Jun–Aug | 115 (27) | 83 (37) | 15 (38) | 13 (9) | 4 (16) | |
| Fall, Sep–Nov | 203 (47) | 143 (63) | 24 (62) | 33 (24) | 3 (12) | |
| Winter, Dec–Feb |
112 (26) |
0† |
0† |
94 (67) |
18 (72) |
|
| Sex, no. (%) | ||||||
| F | 205 (48) | 107 (47) | 16 (41) | 69 (49) | 13 (52) | |
| M |
225 (52) |
119 (53) |
23 (59) |
71 (51) |
12 (48) |
|
| Sexual maturity, no. (%) | ||||||
| Juvenile | 178 (41) | 117 (52) | 1 (3) | 56 (40) | 4 (16) | |
| Mature |
252 (59) |
109 (48) |
38 (97) |
84 (60) |
21 (84) |
|
| Continuous median length, cm (IQR) |
31 (26–39) |
29 (25–37) |
41 (36–43) |
30 (26–36) |
39 (33–42) |
|
| Wounds, no. (%) | ||||||
| No | 316 (73) | 173 (77) | 11 (28) | 115 (82) | 17 (68) | |
| Yes |
114 (27) |
53 (23) |
28 (72) |
25 (18) |
8 (32) |
|
| Weight, g, no. (%) | ||||||
| <122 | 212 (49) | 129 (57) | 1 (3) | 77 (55) | 5 (20) | |
| >122 | 218 (51) | 97 (43) | 38 (97) | 63 (45) | 20 (80) | |
*IQR, interquartile range.
†No periods before the intervention period were conducted during winter.
Page created: January 17, 2018
Page updated: January 17, 2018
Page reviewed: January 17, 2018
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