Immunostimulated bees receive increased social interactions from untreated nestmates. Bees were reared in cages, 10/cage until they were 7 days old. Individual bees were removed from cages and handled and treated with carbon dioxide (sham), injected with saline, or injected with lipopolysaccharides (LPS). After 4 hours, treated bees were returned to their original cage and non-agonistic social interactions (antennating, allogrooming) with untreated nestmates were monitored during a 5-minute period. Data were collected into two independent colonies (12 sham bees; 11 saline-injected bees; 12 LPS-injected bees). Figure shows effects of treatment on median ± the semi interquartile range frequency of social interactions (H(2) = 11.68; P < 0.002). Post-hoc tests: * P < 0.05, ** P < 0.01.