Just why the attacks failed is not known, but some experts suspect the cult did not sufficiently refine the particle size of its agents and that it was working with an avirulent strain of anthrax.

but not in commensal (i.e., avirulent) strains? What genes are highly expressed during infection of the human (or animal) host? What genes are required for growth in the host? The answers to these ...

Less virulent pathogens or avirulent (not harmful) ones may cause an initial infection that takes longer to cause symptoms. These types of pathogens will cause a mild disease or may be asymptomatic.

Overall, the novel APEC strains exhibited different degrees of pathogenicity in both in vivo and in vitro assays. Some strains showed high virulence in all assays while some were less virulent ...

Just why the attacks failed is unclear, but some experts suspect the cult did not sufficiently refine the particle size of its agents and that it was working with an avirulent strain of anthrax.