The expression of tem 3 d postinfection also showed an increasing trend with the increase in the number of soldiers: there were significant differences between 18:2 and 16:4 groups ( p = 0.000), and between 18:2 and 14:6 groups ( p = 0.002) were significant.
Moreover, although the mortality within group between soldiers and workers in each composition was found to be not significantly different ( p > 0.05), the mortality of workers showed a trend of higher than that of a soldier in the group 12:8 and 10:10 ( Figure 2 ).
Studying the relationship between social immunity and caste distribution is highly significant for clarifying the mechanism of demographic division of labor driven by the disease in termites.