The Plasmodium transmission-blocking symbiont, Microsporidia MB, is vertically transmitted through Anopheles arabiensis germline stem cells.

Microsporidia MB is a promising candidate for developing a symbiont-based strategy for malaria control because it disrupts the capacity of An. arabiensis to transmit the Plasmodium parasite. The symbiont is predominantly localized in the reproductive organs and is transmitted vertically from mother to offspring and horizontally (sexually) during mating.

Draft genome of sp. MB-a malaria-blocking microsporidian symbiont of the .

We report the draft whole-genome assembly of sp. MB a symbiotic malaria-transmission-blocking microsporidian isolated from in Kenya. The whole-genome sequence of sp.