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A bacterial species that is a natural host of Bacillus virus phi29. The host identity matters when distinguishing that bacteriophage from unrelated Escherichia coli bacteriophages.

The named bacteriophage, Bacillus virus phi29, infects Bacillus subtilis; the paper's identification of Escherichia coli as its host is incorrect. This correction does not alter the idealized geometry or numerical inputs used below.^[ref]