TABLE 3.
Summary of developmental and feeding success of D. andersoni female ticks experimentally infected with R. rickettsii (Como-96) and uninfected controls incubated at 4 or 21°C
| Parameter | Infected ticks
|
Control ticks
|
||
|---|---|---|---|---|
| 4°C | 21°C | 4°C | 21°C | |
| Survivala | 54.2% (64/120) | 32.8% (44/134) | 75.7% (106/140) | 81.0% (111/137) |
| Feedinga | 46.7% (21/45) | 16.7% (4/24) | 80.0% (16/20) | 76.2% (16/21) |
a
Chi-square tests of observed mean relative to expected mean with one degree of freedom determined that the survival success and feeding success of infected ticks incubated at 4°C were significantly greater (P < 0.01) than those held at 21°C but still significantly lower (P < 0.005) than those of uninfected controls. Results are given as percentages (number showing successful survival or feeding/total number).