Bacteria living in worms—more specifically nematodes—may act as a natural repellent against mosquitoes based on exciting research out of the Paskewitz lab.  Additional research is needed, but in initial studies, the tested bacterial extract was as effective as repellents such as DEET when used at lower doses: https://madison.com/wsj/news/local/health-med-fit/mosquito-repellent-could-use-bacteria-not-chemicals-uw-madison-researchers/article_45e98ae2-6412-537a-a41a-0a456503dcb1.html

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