Table 6.
Risk factors associated of dogs with ticks and fleas PCR-positive to Rickettsia spp. determined by Poisson regression analysis.
| Ectoparasite | Variable | Class | n | PCR positive | % | 95% IC% |
RR |
ICRR |
p | p-Wald | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| LL | UL | LI | LS | |||||||||
| Ticks | Breed | Mixed | 73 | 21 | 28.8 | 18.7 | 43.1 | |||||
| Purebred | 55 | 17 | 30.9 | 18.4 | 39.2 | 1.2 | 1.0 | 1.4 | 0.035 | |||
| Flea treatment | No | 41 | 18 | 43.9 | 11.5 | 31.5 | ||||||
| Yes | 65 | 14 | 21.5 | 28.7 | 59.1 | 0.4 | 0.6 | 0.8 | 0.016 | |||
| Fleas | Breed | Mixed | 100 | 31 | 31.0 | 27.1 | 51.0 | |||||
| Purebred | 64 | 25 | 39.1 | 21.9 | 40.1 | 1.4 | 1.2 | 1.6 | <0.001 | |||
| Number of people living with the dog | 0 | 28 | 8 | 28.6 | 20.0 | 37.1 | 0.001 | |||||
| 1–3 | 95 | 35 | 36.8 | 31.9 | 41.8 | 1.7 | 1.2 | 2.4 | 0.002 | |||
| ≥4 | 41 | 13 | 31.7 | 24.4 | 39.0 | 1.6 | 1.1 | 2.3 | 0.008 | |||
| Having an owner | Yes | 133 | 48 | 36.1 | 10.4 | 41.2 | ||||||
| No | 31 | 8 | 25.8 | 27.9 | 44.3 | 0.6 | 0.4 | 0.8 | <0.001 | |||
| Being an indoor or outdoor dog | Indoor | 49 | 21 | 42.9 | 35.8 | 49.9 | 0.006 | |||||
| Indoor/outdoor | 29 | 10 | 34.5 | 25.7 | 43.3 | 1.0 | 0.8 | 1.3 | 0.802 | |||
| Outdoor | 86 | 25 | 29.1 | 24.2 | 34.0 | 0.8 | 0.6 | 0.9 | 0.006 | |||
n: number of individuals +: number of seropositives %: seropositive percentage CI: confidence interval RR: rate ratio LL: lower limit UL: upper limit p: rate ratio probability p-Wald: Wald test probability.