Fig. 6.

Survival curves (±1 S.E.) for flies maintained at 17, 25, or 29 °C before infection with (a) P. aeruginosa or (b) L. lactis. (a) There is no effect of pre-infection temperature regime on mortality when flies are infected with the gram-negative bacteria (Proportional Hazards model ${\chi }_2^2$, P = 0.756). (b) However, in flies infected with the gram-positive bacteria, there is a significant difference in mortality rate (Proportional Hazards model, ${\chi }_2^2$, P = 0.0019), with 29 °C flies having a greater mortality rate than 17 °C flies (Proportional Hazards model ${\chi }_1^2$, P = 0.0021).