From 1991-2016, the following research topics included, in particular:
- Natural history of the host-parasite relationship: This included studies of the prevalence, infection intensity, and geographical distribution of infectious parasites in bumblebees. In addition, host-parasite interaction specificity was documented and studied to the level of genotype.
- The role of genetic diversity in hosts as defence against parasites.
- The pattern and processes that generate and maintain genetic diversity in the parasites.
- Activation of immune defences in the host, B. terrestrial, in response to various kinds of challenges.
- Demonstration and use of immune priming at the level of individuals (recurrent infections), and across generations (trans-generational priming).
- Genetics and genomics of the host, by starting and completing the Bombus genome project. This included the establishment of the Bombus immune genome.
- Genetic and genomics of the host, by establishing the Crithidia genome project (in completion).
- The evolution of recombination in response to parasitism. This work was done with the flour beetle Tribolium castaneum.
- Immune priming in Tribolium beetles.