After a lot of reading I realize that if the interaction with diet and infection is significant then I can either (correct me if I am wrong) a) Run separate Anova's on each of of the days with diet infection and diet*infection in my model b) The Slice approach gives tests of simple effects c) use pre-planned contrasts for each day which is an overkill D) Run multiple comparisons (pdiff). For the D) approach there are multiple ways of adjusting for multiple comparisons. The question is whether the pdiff=all option is appropriate or whether I need to use the i.e the adjust=Tukey option. However the adjust options will take into account all 15 days when calculating pairwise comparisons. Since I am interested only in pairwise comparisons within the same day which would be the best approach? Is there someone who could help?
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