" the impact of different virus infection loads in eggs on subsequent developmental stages is currently unknown. Further research, where eggs with different virus infections are reared in vitro, could improve our understanding of the impact that vertical transmission has on antiviral responses and honey bee health."

How about this rewording?

" the impact of different virus infection loads in eggs on subsequent developmental stages is currently unknown. Further research should explore the mechanisms by which these initial infection loads do not lead to much higher later infections threatening honey bee health."

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